locks in openglWindow.

- don't even try to process selection buffer if model is empty (partial fix for bug #1)

 ***** Please let me know if you see any graphic "strangeness" after updating your copy:
 ***** this is a potentially dangerous commit

May need a slight change to better handle options for meshes of order >2

(useful for large datasets with number of components != 1, 3 or 6,
for which doing Plugin(Extract) would be too expensive)

- more general way to use static runtime in msvc (trying to replace the oofelie hack)

finished up first pass at remote view management:

* interactive stuff is now almost feature-complete (including
  multi-step, axes and adaptive refinement)

* plugins can now be executed on remote views

* renamed GmshRemote->ConnectionManager & GmshDaemon->GmshRemote

serialization of options)

make '0' shrotcut ("reload") work more like in previous versions (just push
back new model on the pile, don't clear everything else: useful when modifying
geometries on the fly to show changes)