hdf5_ep

[svn-r16694] Purpose: Fix bug 1526

Description:
Previously, H5Lcopy and H5Lmove would (through H5L_move) improperly apply the
"create intermediate groups" property to the source path traversal, and not the
destination.  Fixed it to apply the property to the destination and not the
source.  Also fixed H5Lcreate_ud to reject internal link classes without
throwing an assertion.

Tested: linew, jam, smirom (h5committtest)