[PATCH/RFC] send-email: allow multiple emails using --cc --to and --bcc

Junio C Hamano [off-list ref] writes:

Remi Lespinet [off-list ref] writes:

    Accept a list of emails separated by commas in flags --cc, --to
    and --bcc.  Multiple addresses can already be given by using
    these options multiple times, but it is more convenient to allow
    cutting-and-pasting a list of addresses from the header of an
    existing e-mail message, which already lists them as
    comma-separated list, as a value to a single parameter.

perhaps?

I've taken this description for the first part of the commit
message. Thanks!

quoted

before handling more complex ones such as names with commas:
        $ git send-email --to='Foo, Bar [off-list ref]'

Shouldn't this example send to two users, i.e. a local user Foo and
the mailbox 'foobar' at example.com whose human-readable name is
Bar?  If so, that is a bad example to illustrate the aspiration for
the finished patch?

Yes, that works if Foo is in an alias file, so that's clearly a bad
example, I added quotes:

	git send-email --to='"Foo, Bar" [off-list ref]'

Thanks!