mergeParams, spell check, new upating/split mode

This release adds several major features for CLI authors & CLI users: mergeParams to synthesize input from multiple sources, more flexible calling of generated dispatchers, parseOnly/setByParse mode, better error checking, and for the CL user spell check/suggest on long params/subcommand names, a much simpler single argument update mode for ^= & friends, and a user-chosen delimiter split-mode syntax to supplement that, and probably other things I'm neglecting to mention.

See RELEASE-NOTES and git/github logs for more details.