Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Apologies for the massive changes in the external API (that's my fault),
and for the terrible codename for this release (that's @tclem's fault).

The detailed overview for the major API changes can be found in the
commit at 72a3fe42.

Major new features in this release:

	- Real caching and refcounting on parsed objects
	- Real caching and refcounting on objects read from the ODB
	- Streaming writes & reads from the ODB
	- Single-method writes for all object types
	- The external API is now partially thread-safe
	- Improved reference handling
	- New method to list references
	- ZLib is now built-in
	- Improvements to the Revision Walker
	- Tons of bug fixes

Thanks to all the contributors who make this possible.

Signed-off-by: Vicent Marti <tanoku@gmail.com>

List all the references in the repository, calling a custom
callback for each one.

The listed references may be filtered by type, or using
a bitwise OR of several types. Use the magic value
`GIT_REF_LISTALL` to obtain all references, including
packed ones.

The `callback` function will be called for each of the references
in the repository, and will receive the name of the reference and
the `payload` value passed to this method.

Fix the doxygen comments for git_index_open_inrepo(). Previously they
referred to a param index_path and omitted index (probably a c&p
error).

The current behaviour of git_index_open{bare,inrepo}() is unexpected.
When an index is opened, an in-memory index object is created that is
linked to the index discovered by git_repository_open(). However, this
index object is empty, as the on-disk index is not read. To fully open
the on-disk index file, git_index_read() has to be called. This leads to
confusing behaviour. Consider the following code:

	git_index *idx;
	git_index_open_inrepo(&idx, repo);
	git_index_write(idx);

You would expect this to have no effect, as the index is never
ostensibly manipulated. However, what actually happens is that the index
entries are removed from the on-disk index because the empty in-memory
index object created by open_inrepo() is written back to the disk.

This patch reads the index after opening it.

Fix a doxygen typo ("@para" instead of "@param") in odb.h

Fix a few minor typos in the documentation of the GIT_ERROR codes.

Temporary files when doing streaming writes are now stored inside the
Objects folder, to prevent issues when moving files between
disks/partitions.

Add support for block writes to the ODB again (for those backends that
cannot implement streaming).

MSVC doesn't swallow that.

In the same spirit that git_repository_lookup is no longer available,
add wrappers so the users don't have to cast when closing their
objects.

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

Add remove_placeholders() test helper function which recursively removes marker files from a directory structure

We have removed the hooks folder because it takes a lot of space

The folder creation is now decorrelated from the recursive parsing of the source tree structure.

Those functions now return prettified rooted path.

see https://github.com/libgit2/libgit2/issues#issue/84

When the system temporary folder is located on a different volume than the working directory into which libgit2 is executing, MoveFileEx() requires an additional flag.

git_time_t is defined as a signed 64 integer. This allows a true predictable multiplatform behavior.

Thanks to Carlos Martín Nieto for spotting this.

Free the ref_file buffer at the end of the function also on
success. This fixes a small memory leak.

Hey. Apologies in advance -- I broke your bindings.

This is a major commit that includes a long-overdue redesign of the
whole object-database structure. This is expected to be the last major
external API redesign of the library until the first non-alpha release.

Please get your bindings up to date with these changes. They will be
included in the next minor release. Sorry again!

Major features include:

	- Real caching and refcounting on parsed objects
	- Real caching and refcounting on objects read from the ODB
	- Streaming writes & reads from the ODB
	- Single-method writes for all object types
	- The external API is now partially thread-safe

The speed increases are significant in all aspects, specially when
reading an object several times from the ODB (revwalking) and when
writing big objects to the ODB.

Here's a full changelog for the external API:

blob.h
------

	- Remove `git_blob_new`
	- Remove `git_blob_set_rawcontent`
	- Remove `git_blob_set_rawcontent_fromfile`
	- Rename `git_blob_writefile` -> `git_blob_create_fromfile`
	- Change `git_blob_create_fromfile`:
		The `path` argument is now relative to the repository's working dir
	- Add `git_blob_create_frombuffer`

commit.h
--------

	- Remove `git_commit_new`
	- Remove `git_commit_add_parent`
	- Remove `git_commit_set_message`
	- Remove `git_commit_set_committer`
	- Remove `git_commit_set_author`
	- Remove `git_commit_set_tree`

	- Add `git_commit_create`
	- Add `git_commit_create_v`
	- Add `git_commit_create_o`
	- Add `git_commit_create_ov`

tag.h
-----

	- Remove `git_tag_new`
	- Remove `git_tag_set_target`
	- Remove `git_tag_set_name`
	- Remove `git_tag_set_tagger`
	- Remove `git_tag_set_message`

	- Add `git_tag_create`
	- Add `git_tag_create_o`

tree.h
------

	- Change `git_tree_entry_2object`:
		New signature is `(git_object **object_out, git_repository *repo, git_tree_entry *entry)`

	- Remove `git_tree_new`
	- Remove `git_tree_add_entry`
	- Remove `git_tree_remove_entry_byindex`
	- Remove `git_tree_remove_entry_byname`
	- Remove `git_tree_clearentries`
	- Remove `git_tree_entry_set_id`
	- Remove `git_tree_entry_set_name`
	- Remove `git_tree_entry_set_attributes`

object.h
------------

	- Remove `git_object_new
	- Remove `git_object_write`

	- Change `git_object_close`:
		This method is now *mandatory*. Not closing an object causes a
		memory leak.

odb.h
-----

	- Remove type `git_rawobj`
	- Remove `git_rawobj_close`
	- Rename `git_rawobj_hash` -> `git_odb_hash`
	- Change `git_odb_hash`:
		New signature is `(git_oid *id, const void *data, size_t len, git_otype type)`

	- Add type `git_odb_object`
	- Add `git_odb_object_close`

	- Change `git_odb_read`:
		New signature is `(git_odb_object **out, git_odb *db, const git_oid *id)`
	- Change `git_odb_read_header`:
		New signature is `(size_t *len_p, git_otype *type_p, git_odb *db, const git_oid *id)`
	- Remove `git_odb_write`
	- Add `git_odb_open_wstream`
	- Add `git_odb_open_rstream`

odb_backend.h
-------------

	- Change type `git_odb_backend`:
		New internal signatures are as follows

			int (* read)(void **, size_t *, git_otype *, struct git_odb_backend *, const git_oid *)
			int (* read_header)(size_t *, git_otype *, struct git_odb_backend *, const git_oid *)
			int (* writestream)(struct git_odb_stream **, struct git_odb_backend *, size_t, git_otype)
			int (* readstream)( struct git_odb_stream **, struct git_odb_backend *, const git_oid *)

	- Add type `git_odb_stream`
	- Add enum `git_odb_streammode`

Signed-off-by: Vicent Marti <tanoku@gmail.com>