Fix errors with charts not updating from construction view when modifying alternatives
fix checking of numeric value for new continuous criteria
fix NaN in value function issue with adding new continuous criteria
don't allow criteria with only single value for all alternatives; fix issue with bad file output if criteria created without setting weight
refactoring; show blank cell if continuous domain has no proper min/max values yet
fix issue with sensitivity analysis options not persisting after closing construction view
fix threshold changes causing stacked bars to be persistently greyed out if utility graph view toggled