More specific exceptions in ucar.nc2.units.
* Many of the methods in the package were simply declared to throw "Exception". It turns out that we can often throw something more specific: ParseException or UnitException.
Support PointStream I/O to/from local files.
* Refactored the urcar.nc2.ft.point.remote package pretty heavily.
* This is just a first pass. Need lots of testing next.