* v1.13.8 broke collision resolving for non-identical files;
the correct filename was reserved but not symlinked to
the original file, leaving a zerobyte file instead.
See v1.14.3 github release notes for remediation info
* add sanchecks for early detection of index/fs desync;
saves performance and gives less confusing logs
was intentionally skipped to avoid complexity but enough people have
asked why it doesn't work that it's time to do something about it
turns out it wasn't that bad
* permission `.` grants dotfile visibility if user has `r` too
* `-ed` will grant dotfiles to all `r` accounts (same as before)
* volflag `dots` likewise
also drops compatibility for pre-0.12.0 `-v` syntax
(`-v .::red` will no longer translate to `-v .::r,ed`)