Merge branch 'develop-get-monthly-from-daily' into 'master'

Develop get monthly from daily

Hi,

   In this branch, I have modified get_diagsMMO so that when the user requests monthly mean variables, the raw daily means from the MMO files will also be concatenated and monthly means will be computed from these daily means and they will be added to the file containing the raw monthly means.

Best regards
Virginie