make the prefix options optional; fix SVN for the case that the parent folder does...
-rw-r--r-- 6 .gitignore
-rw-r--r-- 3524 build_system.py
-rw-r--r-- 1329 mass-build.conf.kde.sample
-rwxr-xr-x 5654 mass_build.py
-rw-r--r-- 2522 vcs.py