TSSV-Lite and performance boost.

Introduced the new tssvl (TSSV-Lite) program, which gives much more concise output than the full-blown program and does not use the STR regular expressions (and therefore also lacks the distinction between new and known alleles).

This Merge Request also includes a much faster implementation of the alignment algorithm, using SSE2 instructions. Depending on the length of the input sequences, it is about 3-4x faster than the implementation of TSSV 0.2.5. On systems on which SSE2 instructions are not available, an optimised version of the original algorithm (about 1.5x faster than TSSV 0.2.5) is used.