(still misses image support)
- add toys/msg2pdf
- update configure.ac, Makefile.am etc.
- ensure webkit version agrees with gtk version
- bump version to 0.8.9.4-dev2
- don't build a special 'muile' binary anymore, but build as module for
normal guile
- remove toys muile / procmule (latter may return at some time)
- bug fixes
- however, this is still WIP