0.7.2

This is a minor bug fix release.  It brings:

- A host of fixes to the script plugin (Charlie Brej)
- A change to make the script plugin object based (Charlie Brej)
- make system release file a configure option (Fredric)
- A bunch of leak fixes (Fredric)
- Fix detection of s, S, -s, single on kernel command line (Fredric)
- populate-initrd fixes (Ray Strode)
- debug fixes (Ray)
- compiler warnings (Ray)
- fix max bullet calculation in entry control (Ray)
- Drop "text-pulser" plugin (Ray)
- Makefile clean ups (Ray)