[svn-r6827] Purpose:

added new test files for h5diff
bug fix

Description:
the criteria for determining the correct switch case cast to void* to type* was the data size read from disk.
this was causing problems on Cray T3E, where all integer except char are 8 bytes long

Solution:
changed the criteria for using the memory size instead, which is determined by the same function
that reads the data into memory

the messages " using memory NATIVE_TYPE_X" were  removed, because they might not coincid on different
platforms.

Platforms tested:
Linux 2.4 (rockaway)
SunOS 5.7 (arabica)
IRIX 6.5 (modi4)


Misc. update:

tools/testfiles/h5diff_17.txt

@@ -6,6 +6,5 @@ Comparing <dset1.7> with <dset1.7>
 Warning: <dset1.7> has different maximum dimensions than <dset1.7>
 <dset1.7>: [ 7 ]
 <dset1.7>: [ 8 ]
-using memory type H5T_NATIVE_INT
 0 differences found