added a G_PI_2
* app/appenv.h: added a G_PI_2 * app/brush_header.h * app/pattern_header.h: prefixed each FILE_VERSION with G{BRUSH,PATTERN} to avoid namespace collision * app/patterns.c: reflect above change * app/iscissors.[ch]: merged in Austin's iscissors rewrite.. still unfinished, but it's not like the old one did anything useful anyway ;) -Yosh
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