[Zope-CMF] GenericSetup-based installation backport mostly complete

[Rob Miller]

i managed to get the lion's share of the GenericSetup-based installation 
backported to the 1.6 branch tonight.  the unit tests need to be fixed 
up, and i haven't done anything with the CMFTopic extension profile yet, 
but it is possible to add a functional CMF site TTW.  i'll work on 
getting the tests to pass and the CMFTopic profile working later this week.

this is my first foray into working directly on the CMF, please let me 
know if i miss anything w.r.t. dev process, documentation, etc. 
additional eyes on the changes i've made also appreciated.

cheers,

-r