Item1375: BuildContrib needs support for git-svn

As more and more people are using git (with git-svn) and no longer Subversion only, we need to tweak BuildContrib so it works also with git-svn.

It's just a matter of testing which kind of repository we're in, and use the tools accordingly.

I've already coded something that works, and shouldn't break much, but I'd love feedback from people more used to using BuildContrib than me.

Kenneth, yes, I've even tried to build a release (which explains why I'll be committing soon modifications to the MANIFEST :))

-- OlivierRaginel - 26 Mar 2009

Re-opening as Crawford explained me what the eval I removed in distro:5a1b8d525508 was for: when an extension isn't in source control repository, it shouldn't fail. This is especially useful for auto-porting TWiki extensions using:

perl build.pl twiki && cd ../../../TWiki/.../... && perl build.pl release

Adding revision to current time when it fails

-- OlivierRaginel - 08 Apr 2009

Got a bit carried away in my fix, but this should be better

-- OlivierRaginel - 08 Apr 2009