Revert 682eb74ae0 for single A. in copyrights

Single uppercase letters followed by a period cannot be junk after
all as they are often seen in names as abbrevations such as in:
   John E. Edwards

Signed-off-by: Philippe Ombredanne <[email protected]>

Author: pombredanne

src/cluecode/copyrights.py

@@ -600,9 +600,6 @@ def from_node(
     # parens such as (1) or (a) is a sign of junk but of course NOT (c)
     (r'^\(([abdefghi\d]|ii|iii)\)$', 'JUNK'),
 
-    # Single uppercase letters followed by a period
-    (r'^[A-Z]\.$', 'JUNK'),
-
     # found in crypto certificates and LDAP
     (r'^O=$', 'JUNK'),
     (r'^OU=?$', 'JUNK'),
@@ -620,7 +617,7 @@ def from_node(
     (r'^Agreement$', 'JUNK'),
     (r'^Usage$', 'JUNK'),
     (r'^Please$', 'JUNK'),
-    (r'^Based$', 'JUNK'),
+    (r'^\(?Based$', 'JUNK'),
     (r'^Upstream$', 'JUNK'),
     (r'^Files?$', 'JUNK'),
     (r'^Filename:?$', 'JUNK'),

tests/cluecode/data/copyrights/contributors.txt.yml

@@ -1,7 +1,6 @@
 what:
   - copyrights
 copyrights:
-  - Copyright (c) 2007-2018 Free Software Foundation, Inc.
-  - Copyright 2011 Free Software Foundation, Inc.
+  - Copyright (c) 2015, Contributors
 
 

tests/cluecode/data/copyrights/copyright-discussion-false-positive.txt.yml

@@ -5,3 +5,6 @@ copyrights:
   - Copyright (c) 1990-2005, 2007-2009 Free Software Foundation, Inc.
   - Copyright (c) 90,2005,2007-2009 Free Software Foundation, Inc.
   - Copyright (c) 1990-2005, 2007-2009 Free Software Foundation, Inc.
+  - A. (c) B. (c)
+  - C. copyright D. (c)
+