Better algorithm for TCB -> TDB conversion

[abhisrkckl]

Converts most parameters, including some that were excluded before.

Parameters that are not converted are marked explicitly.

Also includes some sourcery refactors.

[abhisrkckl]

Are you going to update this as discussed to change the default behavior? Or will that be a future PR?

Done.

[dlakaplan]

It looks like you put the conversion factor into a lot of unrelated tests. Does that actually make a difference? If the tests don't do TCB/TDB conversion, is there any step that would notice if the conversion factor is present or not?

[abhisrkckl]

Since we made the conversion factor mandatory, I had to include them in tests whenever Parameter object was getting created. Otherwise the yest will fail.

[dlakaplan]

OK, I guess I thought that the factor need not be mandatory but that the conversion step would fail without it.

[abhisrkckl]

OK, I guess I thought that the factor need not be mandatory but that the conversion step would fail without it.

I think that will be more confusing. If we are going to throw an error for missing scaling factors, I'd prefer it to be thrown when the parameter is added, rather than at a later stage. This will also force the devs to think more carefully about the parameters, IMO.

[dlakaplan]

OK. I can probably merge this, unless you want to present tomorrow first.

[abhisrkckl]

OK... Please merge this. I got all the necessary feedback last week.