Update SConstruct to work with Fink.
Fix bad environment config.
Don't use pkgconfig for libgeotiff. Also more SConstruct cleanups.
Don't use pkgconfig for glib-2.0.
Don't use pkgconfig for gdal.
Don't use pkgconfig for netcdf.
Don't use pkgconfig for zlib.
Don't use pkgconfig for GTK.
Don't use pkgconfig for glade.
Don't use pkgconfig for gmodule-export.
Merge pull request #350 from asfadmin/jsn

Get us 75% of the way to working Darwin builds.