Added DW_PERCENT_INDETERMINATE which can be passed to dw_percent_set_pos() to show a rotating or otherwise indeterminate percent bar on supported platforms. Platforms which don't support it will either show no progress or potentially growing and contracting progress in the future if that doesn't look too weird. Committed from Windows so may be fixes coming for the other platforms soon.

--- a/dw.h	Tue Sep 27 22:38:25 2011 +0000
+++ b/dw.h	Wed Sep 28 08:22:48 2011 +0000
@@ -1390,6 +1390,8 @@
 #define DW_MENU_SEPARATOR ""
 #define DW_NOMENU 0
 
+#define DW_PERCENT_INDETERMINATE ((unsigned int)-1)
+
 /* Return value error codes */
 #define DW_ERROR_NONE      0
 #define DW_ERROR_GENERAL   1