Also added a “description” field for wiki folders.
Right now there’s too many editions listed. I think we should by
default only list editions whose `tiddlywiki.info` file has
`showInListings` set to `true`, and have an `--editions all` command
that lists everything.
@pmario please could you check that the editions in your
`TIDDLYWIKI_EDITION_PATH` are correctly listed?
We’ll keep the docs for the new features in the prerelease edition
until the release of 5.1.5. This means that we can continue to build
the tw5.com edition without including the 5.1.5-specific content.
