Provide some accessors for people that don't have Ensembl objects but still...

Provide some accessors for people that don't have Ensembl objects but still require the SO term mappings for things.

modules/Bio/EnsEMBL/Utils/SequenceOntologyMapper.pm

@@ -266,6 +266,47 @@ sub to_name {
   return $so_name;
 }
 
+=head2 gene_biotype_to_name
+
+    Arg [0]    : Biotype string
+    Description: translates a biotype into an SO term name
+    Returntype : String; the SO term name
+    Exceptions : if cannot map to an SO term
+
+=cut
+
+sub gene_biotype_to_name {
+  my $self = shift;
+  my $biotype = shift;
+
+  if (exists $gene_so_mapping{$biotype}) {
+    return $gene_so_mapping{$biotype};
+  } else {
+    throw "Biotype not found in gene SO mapping $biotype";
+  }
+}
+
+=head2 transcript_biotype_to_name
+
+    Arg [0]    : Biotype string
+    Description: translates a biotype into an SO term name
+    Returntype : String; the SO term name
+    Exceptions : if cannot map to an SO term
+
+=cut
+
+sub transcript_biotype_to_name {
+  my $self = shift;
+  my $biotype = shift;
+
+  if (exists $transcript_so_mapping{$biotype}) {
+    return $transcript_so_mapping{$biotype};
+  } else {
+    throw "Biotype not found in transcript SO mapping $biotype";
+  }
+}
+
+
 =head1 PRIVATE METHODS
 
 =head2 _fetch_SO_name_by_accession