hdf5_chunking_query_bmr

[svn-r30277] Merge revisions 30264, 30268, and 30275 to 1.8 branch

30264:
Fixed an issue that could occur when using H5Pset_alignment where a block could
be unaligned, causing an assertion failure.

30268:
Remove failure causing code in test/mf.c unintentionally added in r30264.

30275:
Rework test_mf_bug1 to work with multi and split drivers.

Tested: h5committest, jelly, ummon (trunk); h5committest, jelly, ummon (1.8)