Re-add write permission fedpkg takes away.

Uploading new sources with fedpkg seems to make files read only after
uploaded in an attempt to maintain their checksum most likely.

tito already generates files with consistent checksums, and this is
breaking if you release to Fedora/RHEL and then try to release anywhere
else.
Fix broken extraction of bugzilla numbers from commits.

Copied files was never getting populated, so files we're not being git
added properly to show up in diff.