GEMPAK upper air prototype
Making times unique.
Adding a .gem file filter.
Add some new formats
Adding a .gem file filter.
Revert "Adding a .gem file filter."

This reverts commit 6f1f74555301c764f073e8c18253e061ce6a0f27.
Some stuff
Merge branch 'master' of https://donmurray@github.com/Unidata/IDV.git
ncidv 4.3.21
Merge remote-tracking branch 'origin/master'