Fix ghp-to-storage dispatch

[zolanaj]

• Prevents a bug in which the model fails to build when both GHP and thermal storage are present
• While decision variables are present for GHP to charge to storage, these are fixed to zero, i.e., GHP cannot charge storage (which is consistent with the original formulation for GHP; it only served load previously)

[adfarth]

Adding a note here to double check that m[:dvHeatToStorage] is indexed on [b,t,q,ts] everywhere (missing t in a few places)

[zolanaj]

Adding a note here to double check that m[:dvHeatToStorage] is indexed on [b,t,q,ts] everywhere (missing t in a few places)

I caught a couple others in addition to the ones you showed, and fixed them here: 4283794

[adfarth]

Thanks for addressing all the comments and fixing this bug!