Dump on screen the control parameters used by IMAGER, for debugging purpose.
DUMP BUFFERS will trace UV data buffer association
DUMP DEBUG list the control variables used for debugging
DUMP MEMORY will give the memory usage. Swapped out memory may not be
accounted in this action.
DUMP METHOD list the CLEAN method internal values
DUMP THREADS give the number of threads used
DUMP USER list the User-specified values for CLEAN method