Fix a logic bug in pc-sysinstall creating partitions.
Improve exit when an error occurs.
Fix parsing to grab values which contain extra '=' signs.
Fix a bug setting the timezone properly.
Fix a usage bug when setting up with gmirror.
Allow a uzip file from local media to be used.
Allow specifying flags for "newfs" when using UFS as the file system.
Run custom commands after doing final cleanup / fstab generation
and such. Also fix using relative path for config file.

Approved by: re (bz)