Prebuild folder removed

Update README.md

Cigar string and read different length bug fixed.

Attempting to merge with master.

Fixed issues with overhanging bases when aligning near a gap while us…

…ing anchored alignment. The first issue was that the incremental hash key should have been reset when an unknown base was met, because it couldn't be 2bitpacked. The other one was that SeqAn, unlike EDlib, reports alignments even if all bases are Xs. I placed a threshold on the edit distance on alignment of the front and back part of a read (before first and after last alignment). These parts should not have edit distance larger than half their length. Otherwise, the read will be clipped on that end.

Updated the README.

Recompiled.