plot set 3, change "varid" to "varnom"
plot set 5, add an error message and fix a typo
Check for the weird case of the computed variable being entirely masked out.
We've seen this, albeit from a bad data file.
In this case, return None instead of the useless variable.
In method compute_plot_var_value, check for an entirely masked-out variable.
This hasn't actually happened however, because it's getting caught in reduced_variable.reduce().
Put source and other title information into the summary plots.
Several plotting improvements, mainly from Dean with input from Jeff -
set template in the right place, comments about what to do next, etc.
Print a warning if no files found.  Probably the user made a mistake.
Changes to support plot set 11 and overplotting a line.
Changes for plot set 11 and overplotting a line.
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel

Conflicts:
	src/python/frontend/diags.py
Compute axis bounds datawc_x1, _x2, _y1, _y2 for vector plots.
Also, added a comment about how these could be done better.
Supply title and source to the contour part of plot set 6.
They can be omitted now from the vector part, but seem to be doing no harm there.
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel
re-ordered options for slightly better clarity
Ensure that vid2,vid2var are always defined.
Put the "can't recognize file" message in a better place.
Polishing and minor corrections, and added a line to write the table (AMWG plot set 1).
Get outputdir from the correctly named option.
Add ignore_alpha when writing a png file.  This makes sure that lettering is over an opaque
background.  There's no use to the default, where lettering is made by turning transparency
on or off in the alpha channel.
Charles says he'll change the default tomorrow, so this change is almost pointless.
added json file with Dean templates, loaded when importing package
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel
A couple imports were still needed to support Charles' changes to how templates are set up.