Bug 23721: Use basketgroup's name to name the CSV export file

When exporting a basket group, the names of the files are different:
 * pdf => aqbasketgroup.name(.pdf)
 * csv => aqbasketgroup.id(.csv)

Better to use basketgroup's name for consistency and readability

Test plan:
Create a basketgroup and export it in pdf and CSV. The name of the
generated file must be the basketgroup's name suffixed by the extension.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>

acqui/basketgroup.pl

@@ -330,9 +330,10 @@ if ( $op eq "add" ) {
 # export a closed basketgroup in csv
 #
     my $basketgroupid = $input->param('basketgroupid');
+    my $basketgroup = GetBasketgroup($basketgroupid);
     print $input->header(
         -type       => 'text/csv',
-        -attachment => 'basketgroup' . $basketgroupid . '.csv',
+        -attachment => ( $basketgroup->{name} || $basketgroupid ) . '.csv'
     );
     print GetBasketGroupAsCSV( $basketgroupid, $input );
     exit;