hdf5_msb

[svn-r16516] To improve the performance of querying the info of a link (bug #1404).  When the index was set to
creation order in query function but there's no creation order indexed in the file, the library
tried to build and sort a table of all links.  To optimize it, let the library use the B-tree for
names of the links.

Tested on jam.  I tested the same change for v1.8 with h5committest.