hdf5_chunking_query_bmr

[svn-r11003] Purpose:
bug fix

Description:
when diffing a string type string , a cycle is made using the hdf5 get_size function, which returns
the type size
some strings might have a NULL terminator character before the type size position
this was noticed on a HDF-EOS file on the HDFEOSVersion attribute which was defined as a type with a 32 size,
but contained a string with 12 characters, making h5diff to compare the extra garbage characters

Solution:
detect the NULL terminator character and end the diff at that position

Platforms tested:
linux


Misc. update: