BitMagic release v5.4.0

Release Notes: BitMagic 5.4.0

1. Fixed minor corner case bug in bm::bvector<>::invert().
   The bug was inversion of a vector of size() == 0.

2. Minor performance improvements for
   bm::bvector<>::find_first_mismatch(..) - find first mismatch between two bit-vectors.

3. New bit-transposed sparse vector algorithm.
   template
   bool sparse_vector_find_first_mismatch(const SV& sv1,
   const SV& sv2,
   typename SV::size_type& midx);

Algorithm helps finding first mismatch between two bit-transposed vectors
without reverse de-transposition, using operations on bit plains.

4. New example for bm::sparse_vector_find_first_mismatch(...)
   https://github.com/tlk00/BitMagic/tree/master/samples/svsample09">
   Use case explains how to implement DNA compression using bit-transposed sparse vector and
   construct comparison function without decode.
   http://bitmagic.io/dna-compare.html

Technical notes:
http://bitmagic.io/bm-5.4.0.html