get rid of internal 'detector' variables

[KaraMelih]

With this 7ee0e30 now it can fetch the detector name from the environment. Thus, we can clear the codes a little bit and ask users to put their names in the environment file once they are installed the package.

In principle, we can also prompt this to the user if the existing detector name is == 'TEST'

[KaraMelih]

Maybe raise a warning if detector name is not set.