setup version v0.2.2
modified:   Makefile: upgrade version to v0.2.2 .
modified:   VERSION: version v0.2.2 .
modified:   _info.txt: add time stamp extraction example for Elphel.
modified:   grab.cpp: add more statistics on live display (i.e. min < mean < max).
modified:   grab.h: minor changes.
modified:   grab.help.output: auto-updated.