There's this comment in dist.py:

# All commands support the global options too, just by adding
# in 'global_options'.

So, that's a bug. I'll do this:

- if a command has a global option (except help) it will be reapplied to
the distribtuion object

- if a command has a global option (except help) but also defines it as
a local command option, it will not be reapplied to the distribtuion object

- if a command has a global option (except help) and it was already
provided at the regular place, it will be ignored and a warning will be
displayed.