dtas 0.19.0 - odd pathname fixes
Non-UTF-8-encoded pathnames now handled properly by dtas-mlib.
Shell-unfriendly filenames are handled properly if they require
ffmpeg (they were always handled properly when using sox).
Some minor URL and doc updates, too, and there's a new
"make symlink-install" target for users who lack permissions
to install RubyGems.
6 changes since v0.18.1 (2021-02-13):
mlib: pathnames may be blobs
README: replace NNTP URL with NNTPS
gemspec: allow building gem without setting VERSION
build: add "symlink-install" target
do not shell-quote filenames for environment
doc: use Tor v3 .onion URLs