hdf5_msb

[svn-r21436] 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.

Tested on jam, linew, and koala.