Sylvie D. 28/02/2020: Ecoclimap SG add STREAM type of IO and compatibility check of number of 20 vegtypes possible (before, only 19 vegtypes was possible with ecoclimap 2)

(cherry picked from commit 0bd1d21d)

Joris P. and Pierre T. 14/02/2019: corrections for the use of MEGAN scheme (always the night in mode_megan) + desactivation of leaf temperature correction with sun/shade + add missing default values

Philippe 16/02/2018: SURFEX: bug correction: allocate some work arrays to 0,1,1 instead of 0,0,1 (crash with XLF)