More stuff.

  - Added repodude.
  - Fixed building against SQLite 3.7.x.
  - Bug fix - package cleanup should be performed in a loop until no packages can be removed.
  - Bug fix - packages with directory symlinks could not be removed because stat() was used instead of lstat().
  - Added usage instructions.
  - Removed annoying 32 bit and GCC 4.6 warnings.
  - Made every executable link only against the libraries it needs.
  - More logging improvements.