change to take advantage of new deletion capabilities of rfe9113
change to take advantage of new deletion capabilities of rfe9113

Instead of looping through each day and only deleting 900,000 triples at
a time, the delete phase now deletes 1/2 of the month in each of 2
separate processes in a single request.

franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python,franzinc/agraph-python