Add --no-FLAG variants of flags

[blyxxyz]

Resolves #84.

I found a way of doing this that's fairly low on manual maintenance.

I noticed the man page includes the version number and the month, so generate.sh should be run for each release after editing Cargo.toml. (Maybe it's time for a checklist?)

[ducaale]

Maybe it's time for a checklist?

I agree 😅. These are the steps I usually do now:

• Update CHANGELOG.md (rename unreleased header to the current date, add any missing changes)
• Bump up the version in Cargo.toml and run cargo check to update Cargo.lock
• commit changes and push them to remote.
• Add git tag i.e git tag v0.9.0
• Push the local tags to remote i.e git push --tags which will start the CI release action.
• publish to crates.io i.e cargo publish

[ducaale]

LGTM