v1.6.2: After data structure update - stable

Note: Starting from this release version numbering conforms to major.minor.patch scheme.

Added:

1. Switch-phylip-out in distance mode which allows storing distance/similarity matrices in Phylip format.

Fixed several bugs from 1.51 release:

1. Incorrect support of k-mer lengths < 16.
2. Very long processing of long k-mers (k >= 26).
3. Segmentation fault when storing minhashed k-mers on a disk (minhash mode).