Review and document BEM coefficient normalization

[ryancoe]

Carrying this from #36... we need to review how/where (i.e., in what functions) we are normalizing and de-normalizing the BEM coefficients. If our approach is logical, leave as is and document. If not logical, update.

[ryancoe]

I believe, this currently works as follows:

1. Somewhere (not sure exactly where...), the BEM coefficients are normalized
2. For every design in a study, the de-normalization is performed in RM3_getPow.m - this certainly doesn't seem logical to me

[ssolson]

@ryancoe making RM3_getPow.m this more logical is under development in #45. What line are you referring to for the normalization?

[ssolson]

@ryancoe is this the line you are referring to?
https://github.com/SNL-WaterPower/WecOptTool/blob/091be7da6b5cfd07e6876cf6dc29e308dd4da259/toolbox/%2BWecOptLib/%2Bmodels/%2BRM3/%40DeviceModel/getHydrodynamics.m#L40-L50

[ryancoe]

It appears that

• Normalization occurs at the end of Read_Nemoh.m:
  https://github.com/SNL-WaterPower/WecOptTool/blob/5a4a488276146d6d6779db300ee0782dd3460cc1/toolbox/%2BWecOptLib/%2Bvendor/%2BWEC_Sim/Read_NEMOH.m#L363

• de-normalization is in getMotion.m
  https://github.com/SNL-WaterPower/WecOptTool/blob/5a4a488276146d6d6779db300ee0782dd3460cc1/toolbox/%2BWecOptLib/%2Bmodels/%2BRM3/%40DeviceModel/getMotion.m#L89-L110

I don't understand the rest of the structure/flow well enough to say if this is the most logical way to do it or not.