Things to document:
- greyed out Metview 3 icons
- pcont -> mcont
- contour splitting
- pgraph -> mgraph
- psymb -> msymb
- advanced mode
- Map View -> Geo View
- curve plotting
- ODB differences (Metview 3 ODB icons will not be visible)
- new legend icon
- ptext->mtext
- pcoast->mcoast
- new resolutions ('high' really is high!)
- new projections
- Cartesian View
- axis plotting
- Macro functions return vectors instead of lists
- Macro functions return nil instead of missing values indicators
- Cross Section, etc: only plot one frame (currently)
- Grib Vectors icon replaces Vectors icon