Remove tablesorter code.

Ability to sort tabular view by score / evalue didn't add much value and was
hence disabled. But we were still carrying dead code.

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Simplify printing of HSP alignments.

And sort out an error in calculating end coordinates per line.

Slightly refactored HSP class in the process:
  - HSP.start  -> HSP.sstart
  - HSP.hframe -> HSP.sframe
  - HSP.hseq   -> HSP.sseq

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>