2.5.51: access permission filesystem 0.12

This *untested* patch adds a new permission managing file system. Furthermore, it adds two modules, which make use of this file system.

One module allows granting capabilities based on user-/groupid. The second module allows to grant access to lower numbered ports based on user-/groupid, too.

Changes:
- updated to 2.5.51
- removed fill_empty_from(), now done by security_fixup_ops()

This patch is available at:
<http://home.t-online.de/home/olaf.dietsche/linux/accessfs/>

Regards, Olaf.