Clean up a bit in guiConstraints.py, add if_exists check in scheduler.py:add_constraint()
Adding mandatory constraints moved to globs.py. Fix repeated calls to gen_start_pop()
Fix indent block for adding mandatory constraints
remove extra call to evolution loop that may have been causing bad results
Fix call to globs.mainScheduler inside Scheduler class
Fixed generate_starting_population being part of the time taken from time_limit
ToolTips only for windows.
Merge branch 'clear_button' of https://github.com/donnell74/CSC-450-Scheduler into clear_button
Merge pull request #29 from donnell74/clear_button

Clear Button fix
Merge branch 'develop' of https://github.com/donnell74/CSC-450-Scheduler into computers

# By Daniel Hebrink (5) and Gregory Donnell (2)
# Via Daniel Hebrink
* 'develop' of https://github.com/donnell74/CSC-450-Scheduler:
  ToolTips only for windows.
  Fixed generate_starting_population being part of the time taken from time_limit
  Fix call to globs.mainScheduler inside Scheduler class
  remove extra call to evolution loop that may have been causing bad results
  Fix indent block for adding mandatory constraints
  Adding mandatory constraints moved to globs.py. Fix repeated calls to gen_start_pop()
  Clean up a bit in guiConstraints.py, add if_exists check in scheduler.py:add_constraint()

Conflicts:
	gui/guiConstraints.py