Mpsd/deb packages

[glaweh]

Several improvements for debian packages:

• make clean removes the generated package files, and they are git-ignored
• buildinfo and changes files are also copied back, important for uploading to local apt repo:
  • you can run debsign -k <key-id> *.changes
  • and then dput <my-repo> *.changes
• add option -O (to keep the original package name, to be consistent with the changes file)
• add option -R (sets the release name in changelog and changes file)
• add option -g (appends the date of the latest git commit to the version number)