send-email: signedoffcc -> signedoffbycc, but handle both

The documentation now mentions sendemail.signedoffbycc instead
of sendemail.signedoffcc in order to match with the options
--signed-off-by-cc; the code has been updated to reflect this
as well, but sendemail.signedoffcc is still handled.

Signed-off-by: Michael Witten <mfwitten@mit.edu>
Acked-by: Jeff King <peff@peff.net>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Documentation/git-send-email.txt

@@ -144,7 +144,7 @@ Automating
 
 --[no-]signed-off-by-cc::
 	If this is set, add emails found in Signed-off-by: or Cc: lines to the
-	cc list. Default is the value of 'sendemail.signedoffcc' configuration
+	cc list. Default is the value of 'sendemail.signedoffbycc' configuration
 	value; if that is unspecified, default to --signed-off-by-cc.
 
 --suppress-cc::

git-send-email.perl

@@ -151,7 +151,7 @@ sub format_2822_time {
 my ($quiet, $dry_run) = (0, 0);
 
 # Variables with corresponding config settings
-my ($thread, $chain_reply_to, $suppress_from, $signed_off_cc, $cc_cmd);
+my ($thread, $chain_reply_to, $suppress_from, $signed_off_by_cc, $cc_cmd);
 my ($smtp_server, $smtp_server_port, $smtp_authuser, $smtp_encryption);
 my ($identity, $aliasfiletype, @alias_files, @smtp_host_parts);
 my ($validate);
@@ -161,7 +161,8 @@ sub format_2822_time {
     "thread" => [\$thread, 1],
     "chainreplyto" => [\$chain_reply_to, 1],
     "suppressfrom" => [\$suppress_from, undef],
-    "signedoffcc" => [\$signed_off_cc, undef],
+    "signedoffbycc" => [\$signed_off_by_cc, undef],
+    "signedoffcc" => [\$signed_off_by_cc, undef],      # Deprecated
     "validate" => [\$validate, 1],
 );
 
@@ -225,7 +226,7 @@ sub signal_handler {
 		    "cc-cmd=s" => \$cc_cmd,
 		    "suppress-from!" => \$suppress_from,
 		    "suppress-cc=s" => \@suppress_cc,
-		    "signed-off-cc|signed-off-by-cc!" => \$signed_off_cc,
+		    "signed-off-cc|signed-off-by-cc!" => \$signed_off_by_cc,
 		    "dry-run" => \$dry_run,
 		    "envelope-sender=s" => \$envelope_sender,
 		    "thread!" => \$thread,
@@ -301,7 +302,7 @@ sub read_config {
 
 # If explicit old-style ones are specified, they trump --suppress-cc.
 $suppress_cc{'self'} = $suppress_from if defined $suppress_from;
-$suppress_cc{'sob'} = !$signed_off_cc if defined $signed_off_cc;
+$suppress_cc{'sob'} = !$signed_off_by_cc if defined $signed_off_by_cc;
 
 # Debugging, print out the suppressions.
 if (0) {