cubicweb-condor #2962925 give control over environment variables [validation pending]

sometimes the current machine's env vars. do not contain what is needed, and a specific override is wanted

prioritynormal
typeenhancement
done in1.0.0
load0.200
load left0.000
closed by#deb6852d6b45 [commands] Allow to avoid using the submitter environment variables and to add manually some other environment variables
patch[commands] Allow to avoid using the submitter environment variables and to add manually some other environment variables [applied]