2.3
Include doc/ in dist tarball.
Make _filedir's "fallback to everything" behavior optional, and off by default.
Added setting COMP_KNOWN_HOSTS_WITH_HOSTFILE `_known_hosts_real' will add hosts from HOSTFILE (compgen -A hostname), unless `COMP_KNOWN_HOSTS_WITH_HOSTFILE' is set to an empty value.
Use --asciidoc-opts="--unsafe" instead of --unsafe for a2x for compatibility with asciidoc < 8.4.5.
Document $split && return.
Remove various comments related to bash versions we don't support