- Hide the remaining transports code
- Drop `git_headarray`, switch to using a callback to list refs. Makes
the code cleaner.

Thanks @carlosmn!

There's no difference between `_free` and `_close` semantics: keep
everything with the same name to avoid confusions.

The ownership semantics have been changed all over the library to be
consistent. There are no more "borrowed" or duplicated references.

Main changes:

	- `git_repository_open2` and `3` have been dropped.

	- Added setters and getters to hotswap all the repository owned
	objects:

		`git_repository_index`
		`git_repository_set_index`
		`git_repository_odb`
		`git_repository_set_odb`
		`git_repository_config`
		`git_repository_set_config`
		`git_repository_workdir`
		`git_repository_set_workdir`

	Now working directories/index files/ODBs and so on can be
	hot-swapped after creating a repository and between operations.

	- All these objects now have proper ownership semantics with
	refcounting: they all require freeing after they are no longer
	needed (the repository always keeps its internal reference).

	- Repository open and initialization has been updated to keep in
	mind the configuration files. Bare repositories are now always
	detected, and a default config file is created on init.

	- All the tests affected by these changes have been dropped from the
	old test suite and ported to the new one.

Don't fail when opening a new config file

reference_rename() cleanup

Fix typos in the README file

Never use the Qt trade mark with both letters capitalized, in the form
"QT".
(http://qt-project.org/trademarkpolicy.html)

Networking improvements

Update all stack allocations of git_filebuf to use GIT_FILEBUF_INIT
and make git_filebuf_open and git_filebuf_cleanup safe to be called
multiple times on the same buffer.

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

This uses the new Clay code. As you can see, the diff is minimal... It
works!

Fix typo in repository documentation

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

It can be useful to separate disconnecting from actually destroying
the object.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

reference_rename used to delete an old reflog file when renaming a
reference to not confuse git.git. Don't do this anymore but let the user
take care of writing a reflog entry.

Signed-off-by: schu <schu-github@schulog.org>

Signed-off-by: schu <schu-github@schulog.org>

Actually rollback when we can't create the new reference. Mark the
rolled back reference as loose.

Signed-off-by: schu <schu-github@schulog.org>

0c49ec2d replaced git_futils_mv_atomic with p_rename without removing its
prototype.

Signed-off-by: schu <schu-github@schulog.org>

A simple branchname as refspec is valid and we shouldn't throw an
error when encountering one.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

Add a next pointer to make it a linked list and add the 'pattern' and
'matching' flags.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

Make it a bit more resilient.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>

There is no good reason to expose the negotiation as a different step
to downloading the packfile.

Signed-off-by: Carlos Martín Nieto <carlos@cmartin.tk>