The new revision walker uses an internal Commit object storage system,
custom memory allocator and much improved topological and time sorting
algorithms. It's about 20x times faster than the previous implementation
when browsing big repositories.

The following external API calls have changed:

	`git_revwalk_next` returns an OID instead of a full commit object.
	The initial call to `git_revwalk_next` is no longer blocking when
	iterating through a repo with a time-sorting mode.

	Iterating with Topological or inverted modes still makes the initial
	call blocking to preprocess the commit list, but this block should be
	mostly unnoticeable on most repositories (topological preprocessing
	times at 0.3s on the git.git repo).

	`git_revwalk_push` and `git_revwalk_hide` now take an OID instead
	of a full commit object.

Set of methods to find the minimal-length to uniquely identify every OID
in a list. Useful for GUI applications, commit logs and so on.

Includes stress test.

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

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

Use a new `gitfo_creat_force` that will create the full path to a file
before creating it.

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

We cannot make sure that the user doesn't use the same buffer as source
and destination, so write to it using memmove.

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

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

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

Should return `void *` for raw bytes.

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

We were checking for the index file, which is not assured to exist on
clean git repositories.

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

add actual must_pass calls back into the repo tests and remove ./ from
beginning of temp repo path

Disable garbage collection of cross-references to prevent
double-freeing. Internal reference management is now done
with a separate method.

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

They are not standard. MSVC complains about them. And that's not good.

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

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

MSVC cannot substract void pointers. Go figure.

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

Yes, these are some seriously massive changes to the external API. We
are breaking stuff.

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

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

- Added several missing reference increases
- Add new destructor to the repository that does not GC the objects

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

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

All `git_object` instances looked up from the repository are reference
counted. User is expected to use the new `git_object_close` when an
object is no longer needed to force freeing it.

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

We now store only one sorting callback that does entry comparison. This
is used when sorting the entries using a quicksort, and when looking for
a specific entry with the new search methods.

The following search methods now exist:

	git_vector_search(vector, entry)
	git_vector_search2(vector, custom_search_callback, key)

	git_vector_bsearch(vector, entry)
	git_vector_bsearch2(vector, custom_search_callback, key)

The sorting state of the vector is now stored internally.

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

The methods previously known as

	git_repository_lookup
	git_repository_newobject
	git_repository_lookup_ref

are now part of their respective namespaces:

	git_object_lookup
	git_object_new
	git_reference_lookup

This makes the API more consistent with the new references API.

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

Tests are now declared with detailed descriptions and a short test name:

	BEGIN_TEST(the_test0, "this is an example test that does something")
		...
	END_TEST

Modules are declared through a simple macro interface:

	BEGIN_MODULE(mod_name)
		ADD_TEST(the_test0);
		...
	END_MODULE

Error messages when tests fail have been greatly improved.

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

Add test deleteref::deleting_a_ref_which_is_both_packed_and_loose_should_remove_both_tracks_in_the_filesystem()

Renaming a packed reference should not pack another reference
which happens to be in both loose and pack state.

Forces a move by creating the folder for the destination file, if it
doesn't exist.

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