/usr/bin/cm_to_wigeon is in wigeon 20101212+dfsg1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/WigeoN/run_CM_to_WigeoN.pl
/usr/bin/../lib/WigeoN/run_CM_to_WigeoN.pl