hdf5_msb

[svn-r13224] Fixed a bug where messages would report their "raw size" as the size of a
shared message rather than the full size of the unshared message, which
confused some shared message code.
Added a test that should make sure that some messages are too small to be
written to the deletion test in tsohm.c.

Also added a small optimization so that hash values don't need to be
calculated on deletes in list indexes.

Tested on Windows, smirom, and kagiso.