moved headers from Task widget to Task model, and using callbacks for the display data instead of switch logic
refactor get_job_board into project.pxi and make a method on the Project object
added more job/task actions as methods on the client Job object
JobProgressBar widget was not scheduling a repaint after having data updated
fix task docs to properly define "tasks" and "layers" as kwargs
Wrangle/Watch panels using common context menu
refs issue #40 - Continuing to update finished jobs for 60 seconds beyond their stop time
minor cleanups to Watch panel
basic argparse added to plow-wrangler