* app/channel.h
* app/gimpimage.h
* app/gimpimageP.h
* app/layer.h
* app/undo.[ch]
* app/undo_types.h: use proper naming convention for undo enums,
and hide them from the pdbgen stuff

* app/procedural_db.h: don't skip PDB_END

* app/undo_history.c: remove gccism from undo_history_append_special

* libgimp/gimpintl.h: INIT_LOCALE should be defined in all cases

* plug-ins/script-fu/Makefile.am: add script-fu-constants.[ch]

* plug-ins/script-fu/script-fu.c: use init_generated_constants

* plug-ins/script-fu/siod.h: #include <stdio.h> for FILE *

* tools/pdbgen/script-fu.pl: new file

* tools/pdbgen/Makefile.am: add rule for constant script-fu gen

* tools/pdbgen/enumgen.pl: add enum skip feature

* tools/pdbgen/lib.pl: use nicks for gimpenums.h

* tools/pdbgen/pdb/procedural_db.pdb: ignore PDB_END

-Yosh