Delete requirement of oemof package

[SabineHaas]

The open_FRED cli requires oemof, see setup.py, but as far as I can see it's not imported in any module.

Did I miss anything? Would you be fine to delete this requirement from open_FRED cli?

The reason why I came across this is that in pvcompare we require feedinlib (which requires open_FRED cli) and the new oemof packages (solph, network, ..). This leads to a dependency issue oemof 0.3.2 requires Pyomo XY ... which is confusing as oemof 0.3.2 is not needed in any of the packages.

[birgits]

I am not quite sure about this and would therefore forward this question to @gnn as he developed this tool. Do you know if oemof is needed here? I think that it's maybe needed for oemof.db?