cameo: call tool compensation from script

- README, lang.l, lang.y: added option "dog" to "tool" command
- lang.y: call tool_comp_paths

cameo/lang.l

@@ -55,6 +55,8 @@ NUM	[0-9]+\.?[0-9]*
 <INITIAL>write			{ BEGIN(FILENAME);
 				  return TOK_WRITE; }
 
+<INITIAL>dog			return TOK_DOG;
+
 <INITIAL>mm			metric = 1;
 <INITIAL>mil			metric = 0;