* plug-ins/gimpressionist/brush.c: Fix to avoid a warning when
closing window.

* plug-ins/gimpressionist/Paper/struc.pgm
* plug-ins/gimpressionist/Paper/Makefile.am
* plug-ins/gimpressionist/Presets/ApplyCanvas
* plug-ins/gimpressionist/Presets/Makefile.am: Added a paper and
preset on request from Bex, to simulate "Apply Canvas".