Remove unused variable
Update my email address to the RWTH one
Deprecate the 'read' methods that take a filename for a PSurface object

This is one step towards separating the PSurface support from the
AmiraMesh support.  The plan is to have users load the psurface
boundary description into a PSurfaceBoundary object, and then
hand that object over to the grid reader.
spelling
Document method taking a PSurfaceBoundary boundary description
Implement static method 'read', to read a PSurface object from a file

This is another step to split PSurface support from AmiraMesh support.
Currently the method only supports the AmiraMesh data file.  However,
support for hdf5 files is coming closer.
Deprecate method 'readPSurfaceBoundary'

The new method of the PSurfaceBoundary class should be used instead.