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
adjust display of approximate runtimes on gui
Set default for instructor computer constraint radiobutton; remove trailing whitespace
Set instructor computer constraint default; correctly set value (bool() does not work for discerning between "True" and "False")
Add okay_to_add_constraint function which calls constraint_adding_conflict and check_constraint_exists;
Rewrite constraint_adding_conflict to account for computer constraint;
Swap return values of constraint_adding_conflict (now returns True if constraint does add conflict) and check_constraint_exists (now returns True if constraint does exist);
Rewrite all relevant functions to account for this switch;
Make whitespace uniform, remove trailing whitespace
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 computers

# By Hana Baldwin (9) and Gregory Donnell (1)
# Via Gregory Donnell (1) and others
* 'develop' of https://github.com/donnell74/CSC-450-Scheduler:
  adjust display of approximate runtimes on gui
  add disclaimer, remove version info
  reduce amount of if statements for runtime value check
  adjust gui text to show that runtime options are approximate
  Remove comments made for debugging
  fix custom input error with tkMessageBox
  add custom input error checking for string/characters
  fix custom input to prevent negative/float errors
  add gui side of runtime option
  Added time logic for evolution loop in the backend, still needs gui logic

Conflicts:
	genetic/scheduler.py
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