hdf5_ep

[svn-r21439] Issue 7701 - H5LTdtype_to_text had memory corruption while being querried about the size of the buffer needed.  The problem happened when the internal buffer is reallocated, the new address got lost.  I revised the code to pass the new address as the return value of functions.  I also added two new test cases.

This commit only includes hl/test/test_lite.c, hl/src/H5LT.c, hl/src/H5LTprivate.h.  All others are property changes of the merge from the trunk.  

Tested on jam, linew, and koala.