longitude sign conventions in BaseMapAdapter & GVAR nav

I have today corrected an earlier oversight and modified 

visad.data.mcidas.BaseMapAdapter and
visad.data.mcidas.GVARnav  (used by GVARCoordinateSystem)

to adhere to the VisAD convention of positive east longitude sign

I hope this does not cause anyone grief.  I have included a
method in each of these, setEastPositive(boolean), which can be
used to restore the old 'positive west' convention.  I hope no
one has to use it...


Tom Whittaker (tomw@xxxxxxxxxxxxx)
University of Wisconsin-Madison
Space Science and Engineering Center
Phone/VoiceMail: 608/262-2759
Fax: 608/263-6738