Implemented Activity moving and removing via the command line.
Improve default file handling.
Print the schedule at the end of a command by default.  Disable with the -q switch.
Renamed the -d (duration) switch to -l (length).
Added Beginning field to Activity.
Implemented Activity beginning through Schedule.
Updated the BeginActivity method in the schedule module.
Accept begin commands in the schedule command line.
Read and write activity beginnings in XML.