repository: Change ownership semantics

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.

1 files changed, 10 insertions, 5 deletions

diff --git a/src/config.c b/src/config.c
index 4e48ff7f4..a8e15405b 100644
--- a/src/config.c
+++ b/src/config.c
@@ -22,15 +22,12 @@ typedef struct {
 	int priority;
 } file_internal;
 
-void git_config_free(git_config *cfg)
+static void config_free(git_config *cfg)
 {
 	unsigned int i;
 	git_config_file *file;
 	file_internal *internal;
 
-	if (cfg == NULL)
-		return;
-
 	for(i = 0; i < cfg->files.length; ++i){
 		internal = git_vector_get(&cfg->files, i);
 		file = internal->file;
@@ -42,6 +39,14 @@ void git_config_free(git_config *cfg)
 	git__free(cfg);
 }
 
+void git_config_free(git_config *cfg)
+{
+	if (cfg == NULL)
+		return;
+
+	GIT_REFCOUNT_DEC(cfg, config_free);
+}
+
 static int config_backend_cmp(const void *a, const void *b)
 {
 	const file_internal *bk_a = (const file_internal *)(a);
@@ -66,7 +71,7 @@ int git_config_new(git_config **out)
 	}
 
 	*out = cfg;
-
+	GIT_REFCOUNT_INC(cfg);
 	return GIT_SUCCESS;
 }