TODO

   1 - Clean up free/
   2 - Remove sighandler.[ch]
   3 - ipaccess: support IPv6
   4 - lfs-test: generalize or kill
   5 - transactions:
   6         - Unit tests
   7         - Resourcification of more libucw objects:
   8                 * bigalloc
   9                 * gary
  10                 * mainloop
  11 - Finish documentation of ucw/string.h