PyFerret v7.0.0 release candidate

PyFerret Version 7.0.0 release candidate
The PyFerret version number was adjust to match that of the Ferret engine source code contained in this module.
Please see the release notes at http://ferret.pmel.noaa.gov/Ferret/documentation/release-notes/
Includes support for forecast-model-run collections.
Includes Python objects (FerDSet, FerAggDSet, FerVar, FerPyVar,FerRegion, FerGrid, FerAxis) and more methods to enable data handling and plotting without (or with minimal) knowledge of the Ferret language.