update leveling system

tenk.skills.py: change from 10 levels to a saner 100 levels. 1000 hours
to level up was a bit much.
tenk.skills.py: adjust calcprogress method to reflect level change.
tests.skills_test.py adjust calclevel tests to reflect level change and
add unit tests for calcprogress
change docstring format

I really like having header comments surrounded by pound signs, but I've
relented to using proper docstrings as per pep8.