parse_color: recognize "no$foo" to clear the $foo attribute

diff --git a/RelNotes b/RelNotes
index 9cd9140a6b6e8ee15dc2b237795b1117b0140842..192f48cc9470b11e01edda4f0a84a257480ca96c 120000 (symlink)
--- a/RelNotes
+++ b/RelNotes
@@ -1 +1 @@
-Documentation/RelNotes/1.7.12.3.txt
\ No newline at end of file
+Documentation/RelNotes/2.1.3.txt
\ No newline at end of file