Update netCDF to 4.3.19

See https://trac.openmicroscopy.org.uk/ome/ticket/6853 and http://www.openmicroscopy.org/community/viewtopic.php?f=13&t=7354

Now that we require Java 1.6 across the board, updating netCDF should be safe.  A few service/test/reader updates were necessary, mainly to remove workarounds for bugs in netCDF 4.0.x that were fixed with later versions.

The main things to verify are:

* both Ant and Maven builds pass
* both Ant and Maven tests pass
* the file from the above forum post opens correctly
* none of the Jenkins builds fail (i.e. due to Imaris HDF or MINC test failures)
* nothing goes funny with the OMERO build or import of Imaris HDF or MINC files into OMERO