Revise latest form of superblock format pretty drastically, to
eliminate unused fields and move rarely used fields into superblock extension.
Finished removing last vestiges of references to (never used) i"shared"
object header message ID.
Added object header messages for non-default v1 B-tree 'K' values
and for driver info.
Updated testfiles to reflect size changes, etc.
Various minor cleanups, etc.
Tested on:
FreeBSD/32 6.2 (duty)
Mac OS X/32 10.4.8 (amazon)
h5repack revision:
1. added a new test due to the introduction of H5Ocopy in the copy of objects (compressed dataset with references, that still must go a second sweep of the file to be regenerated).
2. Moved all the source files from the h5repack test program to a new file h5repacktst.c and removed the old ones (testh5repack*.c).
3. Renamed the binary files from test*.h5 to h5repack*.h5 for easy reference.
4. Modified the shell script to use variables for file names instead of hard coded names
