Item13546: enable store protection by default

But add a warning suggesting that it be disabled if not planning any
migration from RCS.

PlainFileStoreContrib/lib/Foswiki/Configure/Checkers/Extensions/PlainFileStoreContrib/CheckForRCS.pm

@@ -0,0 +1,53 @@
+# See bottom of file for license and copyright information
+package Foswiki::Configure::Checkers::Extensions::PlainFileStoreContrib::CheckForRCS;
+
+use strict;
+use warnings;
+
+use Foswiki::Configure::Checker ();
+our @ISA = ('Foswiki::Configure::Checker');
+
+my @required = (
+
+);
+
+sub check_current_value {
+    my ( $this, $reporter ) = @_;
+
+    return
+      unless (
+        $Foswiki::cfg{Store}{Implementation} eq 'Foswiki::Store::PlainFile' );
+
+    if ( $Foswiki::cfg{Extensions}{PlainFileStoreContrib}{CheckForRCS} ) {
+        $reporter->WARN(
+"This setting can be disabled for slightly improved performance once you can ensure that no RCS history exists within your Store."
+        );
+    }
+}
+
+1;
+__END__
+Foswiki - The Free and Open Source Wiki, http://foswiki.org/
+
+Copyright (C) 2008-2015 Foswiki Contributors. Foswiki Contributors
+are listed in the AUTHORS file in the root of this distribution.
+NOTE: Please extend that file, not this notice.
+
+Additional copyrights apply to some or all of the code in this
+file as follows:
+
+Copyright (C) 2000-2006 TWiki Contributors. All Rights Reserved.
+TWiki Contributors are listed in the AUTHORS file in the root
+of this distribution.
+
+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 the Free Software Foundation; either version 2
+of the License, or (at your option) any later version. For
+more details read LICENSE in the root of this distribution.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+As per the GPL, removal of this notice is prohibited.

PlainFileStoreContrib/lib/Foswiki/Contrib/PlainFileStoreContrib/Config.spec

@@ -13,6 +13,6 @@
 # Check before every store modification that there are no suspicious
 # files left over from RCS. This check should be enabled whenever there
 # is a risk that old RCS data has been mixed in to a PlainFileStore.
-$Foswiki::cfg{Extensions}{PlainFileStoreContrib}{CheckForRCS} = 0;
+$Foswiki::cfg{Extensions}{PlainFileStoreContrib}{CheckForRCS} = 1;
 
 1;

PlainFileStoreContrib/lib/Foswiki/Contrib/PlainFileStoreContrib/MANIFEST

@@ -5,4 +5,4 @@ lib/Foswiki/Contrib/PlainFileStoreContrib.pm 0644 Perl module
 lib/Foswiki/Store/PlainFile.pm 0644 Perl module 
 lib/Foswiki/Contrib/PlainFileStoreContrib/Config.spec 0444 Configuration
 lib/Foswiki/Configure/Checkers/Store/PlainFile/Implementation.pm 0644
-
+lib/Foswiki/Configure/Checkers/Extensions/PlainFileStoreContrib/CheckForRCS.pm 0644