add traceback to log message in build actor.
adapt command builder to use the right Parameter ctrls accessors.
comment this debug statement which triggerred a formatting error.

TODO: review this problem with Bertrand.
mobyle.lib API modifications and minor code corrections.
correct retrieving of execution job no from the Job class.
replace  MobyleError by InternalError

remove unused import too
change Error acording to mobyleError refactoring
replace MobyleError by ConfigError according to MobyleError refactoring
Merge branch 'feature_command_builder' into develop