Try to check for multiple simple lon-lat grids in a dataset, even if it
violates convention.
Added "Export as lebeled text" option for source variables.
Caching directory (if necessary; e.g., when creating GBX fies) moved to
standard location, and flushed when program exists.
Bugfix: Log-10 scale checkbox was not messaging data handler.
Use ScaleDescription to manage scale min and max, tick values, and contours.
Library: (Mac) Quaqua FC updated to version 7.0.1.