- limit for courses was set to low to display current courses
- unused variable docs was removed from local function

The log has options for several levels that can
be set from the command line.
The file is hardcoded as log.txt and can be toggled

- mysql creates database and tables to given mysql if not existent already
- mysql reads last change values from db
- mysql saves ch_date after downloading
- run now takes care for the variables of mysql and studip