Web version improvements for Cloud Computing

[tzanio]

Some ideas for follow-on improvements after the MFEM AWS tutorial:

• Fix memory issue in Significant increase in memory usage glvis#236 that prevents us to run e.g. mpirun -np 1 ex1p -m ../data/square-disc-p2.mesh

• Improve performance, right now there is a noticeable delay before the visualization is ready

• Fix the reset of state when a new data is sent (e.g. sending a stream, manipulations, and sending the same stream again should reset the view)

• Support multiple GLVis windows either by multiple glvis-browser-server instances or by glvis-browser-server handling redirection of e.g. 19916+i to 8080+i for a range of i = 0, 1, 2,...

• The parallel vis is still glitchy, see e.g. mpirun -np 4 ex25p -o 2 -f 8.0 -rs 2 -rp 2 -prob 4 -m ../data/inline-quad.mesh

• Anything else?