posting progress on main file rework

- splatfilch.py
    - ripped out previous preprocessing section
    - preprocesing section seems complete
    - added lots of comments
- configfile.py
    - removed lastrun format checking (moved to get_lastrun() in
      Support.py)
- LogSetup.py
    - returns the logging object instead of just setting it up
- Support.py
    - prepare_env() added: creates all needed folders
    - get_cache() added: opens or creates the cache
    - get_lastrun() added: returns datetime of last run, also
      verifies the format
    - check_connection() moved to Support, was in main
    - added all required imports