Building energy fix (issue #803).

[olyson]

Description of changes

There is an implicit assumption in the urban building energy model that building width equals street width. However, this assumption has been relaxed and building width is now derived from the morphology dataset.

Specific notes

There is an implicit assumption in the urban building energy model that building width equals street width. However, this assumption has been relaxed and building width is now derived from the Jackson morphology dataset. Specifically, the equations which use H/Ws (building height over street width) now use H/Wb (building height over building width). Building width is derived from (Ws*froof)/(1-froof), where froof is the roof (building) fraction.
A simulation with the new equations indicate that as expected, for froof=0.5, answers are identical (because H/Ws = H/Wb). Differences in other cases depend on the degree of departure from froof=0.5 and the presence and magnitude of space heating and air conditioning.

Contributors other than yourself, if any: None

CTSM Issues Fixed (include github issue #): #803

Are answers expected to change (and if so in what way)? Yes, but only for urban landunits. The effects on grid cell averages are very small as shown by the diagnostics from this year 2000 case:

http://webext.cgd.ucar.edu/I2000/clm50_ctsm10d098_1deg_GSWP3V1_CON_FIXBUILDENERGY_2000/lnd/clm50_ctsm10d098_1deg_GSWP3V1_CON_FIXBUILDENERGY_2000.1991_2010-clm50_ctsm10d098_1deg_GSWP3V1_CON_2000.1991_2010/setsIndex.html

Any User Interface Changes (namelist or namelist defaults changes)? No.

Testing performed, if any:
The clm_short testlist was run. All pass except comparison to ctsm1.0.dev098 baseline was not bfb as expected.

[ekluzek]

I appended this onto the luna-bug fix branch tag and ran the testing. All tests have passed as expected, and the clm4_5 answers don't change as expected.