hdf5_msb

[svn-r9982] Purpose:
bug fix plus minor modifications
Description:
The nbit filter makes a wrong assumption that function H5Z_set_local_nbit
and H5Z_filter_nbit will be called together. It uses 2 local variables
outside these functions to pass information from H5Z_set_local_nbit to
H5Z_filter_nbit.

Solution:
Store the two variables in cd_values[], which can be retrieved when
H5Z_filter_nbit is called independently.
Platforms tested:
heping, copper
Misc. update: