All of the tasks print messages to standard output. On some occasions it is desirable for
more or less information to be displayed to the user. For this reason the verbosity of all
the tasks can be modified by use of the MSG_FILTER parameter. This parameter controls
the messaging level of the tasks and can take values of NORM (normal messaging level),
VERB (verbose) or QUIET [18]. Note that warning messages (such as forgetting to flatfield)
are always displayed whereas the general messages can be turned off by using QUIET
mode.