gbrowse accepts a "dbid" URL parameter, but gbrowse_details accepts "db_id"

[nathanweeks]

gbrowse accepts a "dbid" URL parameter; however, gbrowse_details requires "db_id". To avoid confusion, it would be beneficial for gbrowse_details to also accept "dbid", while also accepting "db_id" for backward compatibility; e.g.:

--- cgi-bin/gbrowse_details.orig    2012-10-19 20:09:03.000000000 +0000
+++ cgi-bin/gbrowse_details 2013-02-08 21:35:56.275912837 +0000
@@ -131,7 +131,7 @@
     my $start = param('start');
     my $end   = param('end');
     my $f_id  = param('feature_id');
-    my $db_id = param('db_id');
+    my $db_id = param('dbid') || param('db_id');
     my $rmt   = param('remote');

     $self->state->{dbid} = $db_id if $db_id; # to search correct database