Quite a few fixes, improvements, and changes

See the release notes for details.

Higher compression levels with a trie

While slow, -6 can be impressively shorter. Also see release notes.

New version.

No change. Just for version management.

Change abbrev interface quite a bit

Best to not let that stale release last too long.

Update nimble

Fix last release oops.

Quickie release mostly for `lc`

Just add an abbrev module for usage by at present only lc. So far this only handles the easy cases of same location of single-* in all strings.

Add alias system, helper libs, etc.

See release notes for details.

mergeCfgEnv fix, fromNimble, ["multi"] work

See RELEASE_NOTES.md for more details.

Remove mandatoryOverride, better insensitivity

See release notes for details. Also, this version should generate fewer warnings.

initFromCL & helpCase override

This release adds two features, one sought after from the beginning of the project, namely initFromCL and a more minor one to allow CLI authors to override the rendered spelling of long options in help messages. There are quite a few internal code clean-ups as well, but those should not be visible to client code.