AMWG plot set 6 (vector+contour plots), work in progress.
working on plot set 6, vector+contour plots
working on AMWG plot set 6 (vector+contour plots)
Some functions to map attribute functions over a tuple or other sequence.
Set the title & source in the vector plot when contour & vector plots are overlaid
(Previously they were set in the contour plot, but I've finished only the vector plot so far.
You don't need or want them in both, because they are overlaid.)
Handle a variable in "vars" which is actually a tuple of variables (cdms2 TransientVariable).
The need for this occurs in vector plots.
Support for vector plots, getting the data as a tuple of variables.
New method has_variables() tells you whether a filetable has data for all the specified variables.
Enough to make vector plots (well, just one of them!)  work without breaking other stuff, but this
needs more work.
The main issue solved is that a tuple of variables can be provided to _results instead of a variable.
Probably some var/tuple class would be a better approach.
The biggest issue not solved is choosing the plottype for vector plots.
fixed a typo
plot set 6 is working for one variable, STRESS - and only producing a model or obs (or both)
vector plot, not their difference and not the overlaid contour plot.
I commented out the name and number attributes, so this will not be visible in the GUI
(because the GUI doesn't support it yet).  But you can run it through diags.py.
Restored the name and number of AMWG plot set 6.  I can't hide it from the GUI without hiding
it from diags.py.  I just put a warning message in the plot set name.
Merge branch 'devel' of github.com:UV-CDAT/uvcmetrics into devel