First public pre-release

This first pre-release of bamrescue is able to check bam files for all kinds of corruptions (including truncation, bitflips, bad sectors and frameshifts) and outputs statistics about bgzf blocks and lost data.

It is a bit slower than gzip -t on a single thread, but much faster with more threads.

While not production ready yet, it is already a viable replacement for gzip -t, giving more information in less time.