hdf5_msb

[svn-r12413] Purpose:
Bug fix

Description:
Changed the semantics of --enable-stream-vfd and --enable-shared.
Both are now disabled by default when parallel HDF5 is being built.

Solution:
Both shared and stream-vfd are disabled by default in parallel, but can
be enabled explicitly if the user chooses.
Before, shared was always enabled by default and stream-vfd was
always disabled in parallel.

Platforms tested:
heping, mir (configuration change only)