Removing boost from parallel EAVL, and using raw MPI instead.
Boost and TR1 support is no longer required by configure, even with MPI enabled.

Boost now defaults to disabled if you don't specify a path.
It was no longer required if you didn't have MPI enabled,
and now that we use raw MPI for parallel stuff, we no longer
require it in any case.  I left the checks in, just in case
we need it later, but for the time being we should avoid Boost
to minimize mandatory dependencies, and we can add a
HAVE_BOOST define if we want to support optional boost
coding.

I also made a failed TR1 check no longer a fatal configuration
problem; we aren't using any TR1 code, either.
Removing boost from my workstation config-site file.