Automatic detector naming is too basic

[JJPPeters]

Current implementation is very basic. Improvements could be made by checking for any 'default names' used and trying to add the next one. Possible to have some default angle values too, though what to set them as would mostly be arbitrary.

[ADyson]

Now window opens and says Detector N where N is one greater than the number of detectors already added, so you can always spam the add detector butting without naming them first. #79.