fix: unused options in redis
fix: compatibility between python 2-3
fix: forgot vars declarations
fix: carry conditions in listing redis keys
fix: listing redis list keys
fix: removed duplicated tasks when they are listed
fix: index number when redis DB are listed
fix: some error levels in log
fix: renamed *proc* -> *tasks* files
fix: added the process manager backend for 'tasks' options, thinking in future to add new process managers
