Misc: --paint-exclude & #119

- Add --paint-exclude to prevent certain windows from being painted, for
  debugging purposes.

- Add predefined matching target "x", "y", "width", "height", "widthb",
  "heightb", "border_width", and "fullscreen".

- Fix bug #119, wrong man page install dir in CMake configuration.
  Thanks to sstewartgallus for reporting.

src/compton.h

@@ -478,17 +478,6 @@ dump_drawable(session_t *ps, Drawable drawable) {
   }
 }
 
-/**
- * Check if a window is a fullscreen window.
- *
- * It's not using w->border_size for performance measures.
- */
-static inline bool
-win_is_fullscreen(session_t *ps, const win *w) {
-  return rect_is_fullscreen(ps, w->a.x, w->a.y, w->widthb, w->heightb)
-      && !w->bounding_shaped;
-}
-
 static void
 win_rounded_corners(session_t *ps, win *w);