Fetch strategies: new global option `no_cache`, new git option `get_full_repo`.

* All fetch strategies now accept the Boolean version keyword option `no_cache` in order to allow per-version control of cache-ability.
* New git-specific version keyword option `get_full_repo` (Boolean). When true, disables the default `--depth 1` and `--single-branch` optimizations that are applied if supported by the git version and (in the former case) transport protocol.
* The try / catch blog attempting `--depth 1` and retrying on failure has been removed in favor of more accurately ascertaining when the `--depth` option should work based on git version and protocol choice. Any failure is now treated as a real problem, and the clone is only attempted once.
* Test improvements:
  * `mock_git_repository.checks[type_of_test].args['git']` is now specified as the URL (with leading `file://`) in order to avoid complaints when using `--depth`.
  * New type_of_test `tag-branch`.
  * mock_git_repository now provides `git_exe`.
  * Improved the action of the `git_version` fixture, which was previously hard-wired.
  * New tests of `--single-branch` and `--depth 1` behavior.
* Add documentation of new options to the packaging guide.

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