Guideline adherence

[jokasimr]

Fixes #39 and prepares for #38

The main changes are that

• the detector is loaded separately (S.3).

But it also adds some configuration parameters, such as

• the hdf5 path to the detector that should be loaded from the file.

It also makes the workflow more explicit,

• instead of passing parameters through the coords of the event data object it passes them as arguments to the various providers in the workflow,

so that it becomes more clear what computation depends on what parameters.