wuss parser does not cope with pseudoknots

The WUSS parser routine in jalview.analysis.Rna (see http://source.jalview.org/gitweb/?p=jalview.git;a=commit;h=d5c5166fcfbdaec2297d68e1e47a869e3bf2049b ) does not honour different bracket forms in the WUSS string.

Formally:
( [ { } ) ]

results in the following pairs:
1,5
2, 6
3,4

But the parser will produce:
1,6
2, 5
3, 4