documentation for a little bit of clean up   - rearrange some code blocks, so that now all calculations for     setting up the right-hand-sides done within one single block     (I find that easier to read and understand)   - rearrange freedrift-code to reduce the number of ifdefs   - adjust some indentations and comments
documentation for a little bit of clean up
  - rearrange some code blocks, so that now all calculations for
    setting up the right-hand-sides done within one single block
    (I find that easier to read and understand)
  - rearrange freedrift-code to reduce the number of ifdefs
  - adjust some indentations and comments

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h