Feature/constantspatialparams1p

Merged Timo Koch requested to merge feature/constantspatialparams1p into master

I have found myself implementing this class quite often, or at least copying it from somewhere, so I thought we could actually add it as a default spatial params for 1p models.

The same could be actually done for 2p models with the new interface of !1607 (merged) where all parameters are read from the input file.

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