CTPy-1 Create MongoDB instance for storing simulation output

Ming working for schema definition and validation, as is module/class hierarchy for imports from scripts.  Aggregation query documented for doing mean K_n from stored data.
Adding strategies module for transmission rules, with an empty conformism file which will collect PyParentChooser definitions for different ways of doing conformist transmission.
Basic separation of concerns out of scripts, and creation of a
"parameter sweep" example for the cartesian product of several
parameters, logging everything to the database.