+ Ignore `with_extended_output` arg when reaising the exception, keep
its behavior when `status==0`.

+ Bug discovered after enabling TC in prev commit and rework of fetch.
+ remote_tc: unitestize assertions.
+ util: DEL unused `_mktemp()`.

+ `handle_process_output()` accepts null-finalizer, to pump completely
stderr before raising any errors.
+ test: Enable `TestGit.test_environment()` on Windows (to checks stderr
consumption).

+ cmd: use DEVNULL for non PIPEs; no open-file.
+ TCs: some unitestize-assertions on base & remote TCs.

+ Parse most remote & config-urls \-->/.
+ Used relative daemon-paths.
+ Use git-daemon PORT above 10k; on Windows all below need Admin rights.
+FIXED git-daemon  @with_rw_and_rw_remote_repo():
  + test_base.test_with_rw_remote_and_rw_repo() PASS.
  + test_remote.test_base() now freezes! (so still hidden win_err)

+ repo_test: minor finally delete test-repos created inside this repo.
+ util: delete unused `absolute_project_path()`.

+ Do not abspath twice when contructing cloned repo.
+ Add `git.repo.base` logger.

+ FIX TestRepo.test_submodule_update():
  + submod: del `.git` file prior overwrite; Windows denied otherwise!
+ FIX TestRepo.test_untracked_files():
  + In the `git add <file>` case, it failed with unicode args on PY2.
Had to
encode them with `locale.getpreferredencoding()` AND use SHELL.
+ cmd: add `shell` into `execute()` kwds, for overriding USE_SHELL per
command.
+ repo: replace blocky `communicate()` in `_clone()` with thread-pumps.
+ test_repo.py: unittestize (almost  all) assertions.
+ Replace open --> with open for index (base and TC).
+ test_index.py: Enabled a dormant assertion. 

+ Collect all known commands