restore check for an email address in the #HG User line

scripts/check_series.sh

@@ -36,7 +36,7 @@ do
       echo bad hg header in $i
       continue
     fi
-    if ! head -2 $i | grep '^# User ' >/dev/null
+    if ! head -2 $i | grep ^# User .*[@<]' >/dev/null
     then
       ERRORS=`expr $ERRORS + 1`
       echo bad hg header in $i