Bug 450598

Description of problem:

The RPM doesn't build the MPI version correctly.

Specifically, the FindMPI package in cmake doesn't not find the MPI libraries
and trying to get around this by just setting CXX=mpic++ does not work (it
doesn't trigger the MPI specific build stuff).

Also, because libraries for the two versions are currently being found through a
file in /etc/ld.so.conf.d/, both versions cannot be installed at the same time.

Version-Release number of selected component (if applicable):

3.2.1-6

How reproducible:

Everytime.

Steps to Reproduce:
1.  yum install paraview-mpi
2.  mpirun --mca btl self,sm -np 2 pvserver-mpi

Actual results:

You will get error messages indicating that the socket is already in use.  That
is because it launched two instances of pvserver-mpi and, as they are not
talking to each other, they both try and grab the server socket.

Expected results:

-bash-3.1$ mpirun --mca btl self,sm -np 2 pvserver-mpi
Listen on port: 11111
Waiting for client...

Additional info:

I've attached a patch that fixes the first of these problems.  It does this by
including the FindMPI package from the latest cmake as a patch and using it in
the MPI build instead of trying to make things work through CXX=mpic++.  It also
corrects the launch command to not use mpirun (proper way with paraview 3).

A possible solution for the second problem would be to re-enable install time
rpaths (using $ORIGIN if it was desired to make the install re-rootable). 
Currently, users should not be allowed to install both MPI and non-MPI versions.