Show help on global parameters in subcommands

[nicorikken]

When asking for --help on a subcommand like lint, the global parameters are not shown. Some of these parameters can be very relevant, like calling --include-submodules on lint.

reuse --help
usage: reuse [-h] [--debug] [--include-submodules] [--include-meson-subprojects] [--no-multiprocessing] [--root PATH] [--version] {annotate,addheader,download,init,lint,spdx,supported-licenses,supported-licences} ...

reuse lint --help
usage: reuse lint [-h] [-q]