Merge revisions #25274, #25282 from trunk to revise_chunks.
(Revision #25273 is skipped because it was backed out later on 11/3/2014.)
h5committested.
Description:
    Clean up some unused parameters to v2 B-tree internal routines.

Tested on:
    Mac OSX/64 10.10.0 (amazon) w/serial & parallel
    (h5committest not required on this branch)