Working on in_highest_weight_crystal.
Merge remote-tracking branch 'remotes/TheaxeR/sage/master'
Working on in_highest_weight_crystal still...
Fix the column function
Merge remote-tracking branch 'remotes/TheaxeR/sage/master'
Removed index set assertion from .a()
Initial "correct" version of the in_highest_weight_crystal function
small adjustments
Incorporated scalar function.  Added more descriptions.