Towards MCDV6.0 alpha

[emillour]

Things to do to generate MCDv6.0alpha (due end of sept. 2019):

• High vertical resolution : OK (54 or 73 levels with thermosphere)
• New physics time step and super-cycling => Antoine
• New chemical core : to test. OK, done in
• Improved molecular diffusion => see with Jean-Yves. OK, done in r2157
• Rocket dust storm : OK r2158
• Dust injection "à la Deborah"

=> program some scavenging due to CO2 in the polar regions ??? Francois checks and then Antoine handles it if not too complex
=> Possibly : test by Margaux of an injection using tauref at sol+1 (compared to using tauref at sol+0)

• Modify number of layers in the MCD interface => Ehouarn