so cl-launch can compiled in parallel without declaring a dependency.

Format multiline documentation properly indented,
that is each line should start at the same column.
Print option type too and use little bit wider tabs.

Also, show default value in help.
Feature requested by Levente Mészáros.
Additionally bug fix by Levente whereby we show help correctly
when a name, not a list of names, is provided.

XCVB itself imported a version from ITA's QUUX in early 2009, and modified it.