Added p4est_replace_t, added to refine_ext
Started implementing p4est_coarsen_ext
Gave up on P4EST_REPLACE_BATCH, added balance_ext
Added simple test for p4est_replace_t
Comment updates
Merge branch 'tobin' into cb/pu
Close two bugs
Comment on a bug
Change partition cut functions again
Use new partition_cut functions
Indent test_partition2
doc update for lnodes
Closed balance issues