Better errors, throw a warning when qual is > 62
Added a faster bin counter. Instead of just querying the BAM file for
bins, this will just iterate through the BAM file, and tally bins as it
goes. This is more efficient for smaller sized bins.
Added text annotations to SQZ files as a new chunk type.
Updates to SQZ - added a file-wide SHA1 as well as chunk SHA1s; 
required bringing back suffixinputstream.
new bin-count to handle bin counts in a streaming manner, rather than by
random-access queries of the BAM file.
Extras work with error messages...