Q: Why You code it ?
A: Lukasz Wojtow give me this idea. He need it for his diffprivs
   apache module. Besides I think someone may find it useful.

Q: Is my system with this module secure ?
A: I thing this is bad question. Useing this module (in smart way) don't
   make Your system more or less secure. It just grants some users
   greater privileges, which in normal way You would have to grant with
   root suid programm. Now imagine the programm is exploiteable...
   But, of course general rule is: more features == more possible holes.
