1. Add dap4 modules
2. Modify as many tests as possible
   to move to using remotetest.unidata.ucar.edu
Merge branch '4.5.0' of https://github.com/Unidata/thredds into 4.5.0
Support gzip encoding
clean up Coordinates
Merge remote-tracking branch 'origin/4.5.0' into 4.5.0
orthogonal time2D (1)
fix unit tests
PC Time2D orthogonal (2)
PC Time2D orthogonal (3)
1. fix pom problem where  a reference was to the wrong directory.
2. It turns out that maven is not
   good at handling 3-levels of modules.
   So flatten to two levels
Merge branch '4.5.0' of https://github.com/Unidata/thredds into 4.5.0
Turn off various tests until auth is settled
Fix radar name as well as start/end times.

Also add proper test suite to replace broken tests in main().
Add getCalendarDateUnit() to RadialDatasetSweepAdapter.

Also add to subclasses, etc.
PC Time2D orthogonal - Best PoGC
Get index file naming correct, so putting indexes in cache works