SIP132 Remove litterWater and clean up

[Alomir]

Fixes #132

This PR:

• Removes litterWater and associated code
• Removes fPAR/fAPAR and associated code (general cleanup)
• Adds a python utility to examine smoke test output and report changes

Note: we expect changes in the smoke tests; however, I did verify that the smoke tests still passed after the initial commit, wherein I collapsed evapSoilFluxes and soilWaterFluxes into one function. That's commit f2f8d3b, which has a green check on it below.

After the remaining code changes, I verified that the only output changes were in litterWater and fPAR; see smoke test results pre-submission:
smoke_res.txt

We WOULD expect more changes when LITTER_POOL is on, except that in that test case (russell_3), we also have WATER_HRESP off, which sidesteps the code that would show such changes. We may want to revisit that config in russell_3. (Note: @infotroph said that the soilWater values might match the now-removed litterWater values, which would also hide behavior changes)

[dlebauer]

This looks great. Only request is that we revisit whether we want to keep these obsolete cols (as discussed in slack). Though, that doesn't have to prevent merging this one.

[Alomir]

#145 for removal of obsolete columns