this is a new coo2csr implementation, similar to the work done in #174, but written entirely from scratch, presumably with better performance (space/runtime---i've yet to benchmark it).
things that need to be done before this can be merged:
[ ] merge #164 so we can resolve a TODO in the source code relating to a memory leak
[ ] work out why the klu_klu_test fails (this is also a problem with #174)
[ ] figure out how we can avoid filling the column data array with -1s
this is a new coo2csr implementation, similar to the work done in #174, but written entirely from scratch, presumably with better performance (space/runtime---i've yet to benchmark it).
things that need to be done before this can be merged:
TODOin the source code relating to a memory leakklu_klu_testfails (this is also a problem with #174)-1s