adding in output selection support when noxaxis command is present, can end up with a 0-D array if one output and noxaxis is used, which is odd..

an error I would prefer to just print that and exit(1).

code lines that were not parsed into an object but have been
added as extra lines. This works for me, but we could do
something more sophisticated if needed.

Also pdtype was read in by the photdiode code (as a pdxxx)

output now correctly returns detector values when using out['name']. If yaxis is used to specify multiple outputs values per detector the result of out[name] is a 2d array

adding in new photodiode object which has f1,phi1,f2,phi2,etc., properties so that they can be tuned/put/set. Not fully transffered over from previous one yet.

Large amount of changes to the param object which now include being able to put and set parameters and commands. Also adding the modulator component.

adding string conversion for detectors and components to return its name, you can then get outputs like out[kat.pd1] or out['pd1']

2d plotting examples, probably want to wrap these plots up in a function to make it easier in future. Fixed ordering of output rows/cols in the stored matrix for 2d outputs.