* calendar.py: remove stuff now built in time; some cleanup and
generalization in the calendar printing
* cmd.py: use __init__.
* tzparse.py: This module is no longer necessary -- use builtin time instead!
* Fixed calendar.py, mimetools.py, whrandom.py to cope with time.time()
returning a floating point number. (And fix old bug in calendar)
* Add recursion level to mainloop.mainloop(), to make it reentrant.