Make sure the original backward-delete-char function to be a widget.
Improve non-path spec detection and cancellation.
Update the document and copyright years.
Cancel expansion if it does not seem right.
This is to cope with `git diff ...branch` et al.
"emulate -L zsh" is better than "setopt localoptions noksharrays".
Describe how backward-delete-char works in this magic.
Improve context detection.
Fix markdown errors.
Roll out manydots-magic.