fixed crest market history calls

Fixed getVolumes (debug call)
Added getAvgPrices to be able to do histories in gdoc
Added group_getVolumeAvg to fix "too many instances" bug.  Can give a range of typeIDs and it will return values for all
Added group_getAvgPrices to fix "too many instances" bug.  Can give a range of typeIDs and it will return arrays for all in one call