* Add default license header to files which have no copyright or license header yet.
* yml extension should have been xml...
(cherry picked from commit 1ab2a5f1bc)
* Only pass subcommands when they are specified as module arguments.
* When 'subcommands' is specified, 'link' must be given for every subcommand.
* Extend subcommand tests.
(cherry picked from commit 84d8ca9234)
Co-authored-by: Felix Fontein <felix@fontein.de>
