This allows checkin.php to return a proper HTTP response code when an
error occurs, instead of always returning 200.

Fixes #266, see upstream Issue [1]

[1]: https://mantisbt.org/bugs/view.php?id=34634

The current RegEx string only works when Gitweb is creating the links on 
the page with 'standard' URLs.

Modify RegEx to support finding parent commit ID when GitWeb is using 
pathinfo-formatted URLs [1].

Fixes #418

[1]: https://git-scm.com/docs/gitweb#_path_info_usage

Signed-off-by: Damien Regad <dregad@mantisbt.org>

VCS plugins changes:
- SourceGitweb 2.1.2

This fixes display of the commit time in the wrong timezone when the
original commit received from source control contains timezone info
as was the case with SourceGitea plugin.

Fixes #419 (originally reported in PR #416)