Bug 3423 - In Cataloging, fields are not ordered by tag number

In cataloging, depending on installation and how biblio framework has been
created/modified, fields are not displayed ordered by tag number. For example,
in UNIMARC you can have in tab '2':

  225
  200
  210

This patch order fields in tabs by tag and letter in the tag.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>

C4/Biblio.pm

@@ -938,6 +938,7 @@ sub GetUsedMarcStructure($){
         FROM   marc_subfield_structure
         WHERE   tab > -1 
             AND frameworkcode = ?
+        ORDER BY tagfield, tagsubfield
     /;
     my @results;
     my $sth = $dbh->prepare($query);