git-send-email: add a new sendemail.to configuration variable

Some projects prefer to receive patches via a given email address.
In these cases, it's handy to configure that address once.
Signed-off-by: NMiklos Vajna <vmiklos@frugalware.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

Documentation/git-send-email.txt

@@ -159,6 +159,9 @@ sendemail.aliasfiletype::
 	Format of the file(s) specified in sendemail.aliasesfile. Must be
 	one of 'mutt', 'mailrc', 'pine', or 'gnus'.
 
+sendemail.to::
+	Email address (or alias) to always send to.
+
 sendemail.cccmd::
 	Command to execute to generate per patch file specific "Cc:"s.
 

git-send-email.perl

@@ -191,6 +191,7 @@ sub format_2822_time {
     "smtpserverport" => \$smtp_server_port,
     "smtpuser" => \$smtp_authuser,
     "smtppass" => \$smtp_authpass,
+    "to" => \@to,
     "cccmd" => \$cc_cmd,
     "aliasfiletype" => \$aliasfiletype,
     "bcc" => \@bcclist,