Rules: Rename best64.rule to best66.rule and remove the unknown section from it

docs/changes.txt

@@ -129,6 +129,7 @@
 - Hardware Monitor: avoid sprintf in src/ext_iokit.c
 - Help: show supported hash-modes only with -hh
 - Makefile: prevent make failure with Apple Silicon in case of partial rebuild
+- Rules: Rename best64.rule to best66.rule and remove the unknown section from it
 
 * changes v6.2.5 -> v6.2.6
 

rules/best66.rule

@@ -88,15 +88,3 @@ O02 { { { { { {
 } } } } } '5
 } } } } } } Y4 '4 d
 
-## unknown
-*04 +0 '4
-*05 O03 d '3 p1
-+0 +0 +0 +0 +0 +0 +0 +0
-+0 +0 +0 O12
-Z4 '8 O42
-Z5 '6 O31 ] p1
-Z5 '5 { O02
-d O28 Y4 '4 d
-f *A5 '8 O14
-p2 '7 p1 O58
-O14 d p2 '6