Changes to support plot set 12.
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel
Upgrade to amwg for plot sets 11 & 12
Implemented reduce2level in reductions
Lots of changes to diags for scatter plots; it is ugly!
Misc changes in uvcdat.
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel