MCDv6.1 fixes and improvements towards an MCDv6.2

[emillour]

Various problems have been identified in the current MCDv6.1 at this date:
1) negative values for solar fluxes reflected to space.
2) online interface maps: local time is for lon=0, regardless of map boundaries
3) issue mentionned by Ralf Lorenz: Using the web interface, Perseverance coordinates, Mars data all, local time 13, I can plot various fields of interest, but the ‘Surface Sensible Heat Flux’ is a uniform zero… doesn’t seem right

Improvements: (towards MCDv6.2?)
Note that:

• the MCDv6.1 runs were done with: nircorr=0 whereas "nircorr=1" should be used (scheme requires CO2 and O tracers to be available).
• Now that we have an MY36 dust scenario (and soon a complete MY37) we should make the additional runs.