cameo: new command "stats" to print path statistics

- README: documented the "stats" command
- lang.l, lang.y: added "stats" command
- path.h (path_stats), path.c (path_stats): calculate and print path
  statistics

cameo/lang.y

@@ -2,8 +2,8 @@
 /*
  * lang.y - Toolpath adaptation language
  *
- * Written 2010 by Werner Almesberger
- * Copyright 2010 by Werner Almesberger
+ * Written 2010-2011 by Werner Almesberger
+ * Copyright 2010-2011 by Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -187,7 +187,7 @@ static struct path **classify(struct path **anchor, struct path *path)
 
 %token		TOK_ALIGN TOK_ARRAY TOK_CLEAR TOK_DRILL TOK_EMPTY
 %token		TOK_MILL TOK_OFFSET TOK_OPTIMIZE TOK_REMAINDER TOK_RESET
-%token		TOK_ROTATE TOK_TRANSLATE TOK_Z
+%token		TOK_ROTATE TOK_STATS TOK_TRANSLATE TOK_Z
 %token		TOK_APPEND TOK_GERBER TOK_GNUPLOT TOK_EXCELLON TOK_WRITE
 %token		TOK_DOG TOK_INSIDE
 
@@ -253,6 +253,10 @@ command:
 			rotate(paths, $2);
 			rot += $2;
 		}
+	| TOK_STATS
+		{
+			path_stats(paths);
+		}
 	| TOK_TRANSLATE dimen dimen
 		{
 			translate(paths, $2, $3, 0);