Option flags for git_repository_init_ext.

These flags configure extra behaviors to git_repository_init_ext. In every case, the default behavior is the zero value (i.e. flag is not set). Just OR the flag values together for the flags parameter when initializing a new repo. Details of individual values are:

• BARE - Create a bare repository with no working directory.
• NO_REINIT - Return an GIT_EEXISTS error if the repo_path appears to already be an git repository.
• NO_DOTGIT_DIR - Normally a "/.git/" will be appended to the repo path for non-bare repos (if it is not already there), but passing this flag prevents that behavior.
• MKDIR - Make the repo_path (and workdir_path) as needed. Init is always willing to create the ".git" directory even without this flag. This flag tells init to create the trailing component of the repo and workdir paths as needed.
• MKPATH - Recursively make all components of the repo and workdir paths as necessary.
• EXTERNAL_TEMPLATE - libgit2 normally uses internal templates to initialize a new repo. This flags enables external templates, looking the "template_path" from the options if set, or the init.templatedir global config if not, or falling back on "/usr/share/git-core/templates" if it exists.