Hide clear button if sequence input textarea is empty.

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