Some more structural changes for the MAC Framework chapter of the
Developer's Handbook: break out the "Entry Point Framework" section
into a number of sections: MAC Policy Declaration, Entry Point
Introduction, MAC Policy Entry Point Reference. Re-order sections
a bit so there's a more logical progression and fewer large chunks
of text over many pages. This greatly improves readability.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, Network Associates Laboratories