Adapt the mapping for DAT_SURFACE_TEMP towards 'Surface Air Temperature Change'

[maltemeinshausen]

pymagicc/pymagicc/definitions/__init__.py

Line 463 in b6e9c1a

"SURFACE_TEMP": "Surface Temperature",

The current mapping to 'Surface Temperature" does not seem to mach openscmrunner conventions.

[znicholls]

@lewisjared now we have users finding problems with this too

[lewisjared]

Welcome @maltemeinshausen 😄

I'm guessing the approach would be to support both Surface Temperature and Surface Air Temperature Change temporarily, because not handling Surface Temperature would break things...