Adds a tar.gz that can be used for a bioconda package.
Several code optimizations to speed up both encoding and decoding.
Minor encoding changes include skipping writing TAB after '&' or '$' for a slightly better compression ratios. If you have some popVCF compressed files, please do not update or decode using popVCF v1.0 and re-encode using popVCF v1.1.
Release notes: