[MOAB-dev] MOAB wiki updated

[Dmitry Karpeev]

I've updated MOAB's wiki page: https://trac.mcs.anl.gov/projects/ITAPS/wiki/MOAB
Let me know what you think.
There are  placeholders for Release 4.0.0 and its associated Release
Notes (under "Getting MOAB Code"),
User vignettes (under "Documentation") and "MOAB-based Software
Services" (in the eponymous section).

Please let me know if you think anything is amiss, wrong, in need of
fixing, rearranging, etc.
One thing that needs fixing is the "Current snapshot" in the "Getting
MOAB Code" section: it's date 2007,
so it should probably be updated.

Cheers!
Dmitry.