* Makefile.am: add pixmaps/dropper.xpm to EXTRA_DIST

* app/appenv.h: minor formatting changes

* app/channel.c: #include "gdisplay.h"

* app/color_transfer.c
* app/dodgeburn.c
* app/gdisplay.c
* app/iscissors.c
* app/paint_core.c: remove extra SQR and ROUND definitions

* app/flip_tool.c: hackaround the flip tool options constant problem

* app/flip_tool.[ch]: use InternalOrientationType for flip_tool_flip
prototype

* app/interface.c: use GTK_LABEL case in gtk_label_set_justify

* plug-ins/common/mkgen.pl
* plug-ins/common/plugin-defs.pl: add @extra EXTRA_DIST processing

-Yosh