Harmonizing units

[jb388]

The units that we agreed on for fluxes are as follows:

gC-CO2/gSoil, gC/gC, microgC/gC/h, molC/gSoil/d (or combinations of previous)

I suggest changing all instances of "gC-CO2" to "gC". Specifying "gC-CO2" is redundant as we also have a field for "gasMeasured". I will change all templates accordingly.

Units for time are: "d" for days, and "h" for hours. I am changing all templates to be consistent with this format.