Add SHA-256 output to release builds for the installer, and add Mantis open issue reporting to release and nightly posts.

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10998 387891d4-d844-0410-90c0-e4c51a9137d3
Add missing Mantis module and fix the headers I keep accidentally committing on my Mac.

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10999 387891d4-d844-0410-90c0-e4c51a9137d3
Fix some last remaining issues in the release and nightly post logic from the upgrades.

git-svn-id: svn://svn.icculus.org/fs2open/trunk@11000 387891d4-d844-0410-90c0-e4c51a9137d3