remove the slower _add_partition_ptr in favor of _add_partition_ptr2
remove the slower _add_partition_ptr in favor of _add_partition_ptr2

F1000Research/khmer,souravsingh/khmer,Winterflower/khmer,souravsingh/khmer,Winterflower/khmer,F1000Research/khmer,F1000Research/khmer,jas14/khmer,jas14/khmer,ged-lab/khmer,kdmurray91/khmer,jas14/khmer,kdmurray91/khmer,ged-lab/khmer,Winterflower/khmer,souravsingh/khmer,ged-lab/khmer,kdmurray91/khmer