Chase two additional functions in libstatgrab 0.13 - sg_snapshot and sg_shutdown. Both are null operations on non-Windows platforms, but Python can run on Windows so we should support them. Consequently we now need at least libstatgrab 0.13.
Catch up to new features in libstatgrab 0.10.2.
Stage 3: Add new functions.
Stage 2: Reorder functions and structures to match statgrab.h order.
Stage 1: Update all existing functions to have new names.
Update name of project at the top of all soure files. These files now exist in their own right, rather than as part of the "CMS".
Add duplex globals.
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