Attempt at fixing referencing issue when deep copying the various pykat objects. It was an issue because they create dynamic properties for classes on the fly depending on which components are added, e.g. so that you can do kat.m1. However on copying the class definitions also need to be deep-copied by creating a new class and copying over the properties.

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']