add more parameter dependencies

[jbreue16]

We have started adding parameter dependencies (both state and paramter dependece) in #120

There are still desirable dependencies that are not implemented yet.
Furthermore, we decided to change the return logic of the parameter dependencies to return the values itself, not a modifying prefactor

• expand tests
• DG units parameter dependencies as in FV units
• Film diffusion in GRM (check what weve done there back then and bug fix)
• Change return logic of parameter dependencies so that the value itself is returned, not a factor (done but double check)
• Register parameters s.t. they can be read when reading all parameters
• Add flag to return parameter trajectory over time in output.