hdf5_msb

[svn-r23932] Changes applied to eliminate several compiler warnings in the test directory in files:
dt_arith.c
filter_fail.c
big.c
dynlib2.c
dynlib3.c
Also an HDassert(0 && "Unknown type"); statement was added to all 29 combinations of
case OTHER:
default:
See crucible review HDF5-145 for more details.