- fix rev comp issue where scale got drawn the wrong way round.

- fixed bug when bumping long items not getting cropped

- long item fix

- fix the mark region to be clamped to the seqeunce

- highlight of translation
- also highlight codons for translation

 - highlight the dna given a region and any item with a feature attached

add state tests to interface functions where missing, add code to get local sequences for blixem if required and then call blixem with them. Uses new server call for this.

add code to get any sequences local to the database that should be used for blixem, these then get passed to blixem in a second call.

add code to support new getsequence request to get individual sequences, remove redundant copycontext.

correct calulated index for limit overflow.