Added time logic for evolution loop in the backend, still needs gui logic
add gui side of runtime option
fix custom input to prevent negative/float errors
add custom input error checking for string/characters
fix custom input error with tkMessageBox
Remove comments made for debugging
adjust gui text to show that runtime options are approximate
reduce amount of if statements for runtime value check
add disclaimer, remove version info
Clean up a bit in guiConstraints.py, add if_exists check in scheduler.py:add_constraint()
Merge pull request #23 from donnell74/clear_button

RUN button now recreates and runs the algorithm again.
adjust display of approximate runtimes on gui
Merged develop into timeboxed
Merge pull request #22 from donnell74/timeboxed

Merge Timeboxed into develop
Merge branch 'develop' of https://github.com/donnell74/CSC-450-Scheduler into clear_button
Adding mandatory constraints moved to globs.py. Fix repeated calls to gen_start_pop()