Removed unlock-package command as it is no longer necessary.
Changing the way I pass around lightbulb/tumor propositions.
I like separating the variables and the model, so I created lightbulb-vars and just loaded that from social-net-model
Implementing multi-group capability.

social-net-functions:
-One person can now be in multiple groups, one group, or none (nil)
--If the person is in no group, *the-population* must be set or they will not be recognized by popco.
-Added lisp-style documentation (I like my IDE to tell me what a function does.)

multi-group-model:
-Exactly what it sounds like.  A population with 4 groups, some persons in 0, 1, 2, and 4 groups.  Some persons talk to 0, 1, 3, and 4 groups.  Persons have 0, 1, or 3 listeners.  Each group has a different target analog struc.