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

Hello,

I've corrected an old patch from an Ensimag student. (http://thread.gmane.org/gmane.comp.version-control.git/228182). This patch allows multiple email addresses for options --cc, --to and --bcc. As said in the commit message, this patch doesn't handle commas in name, and the only possibility for using commas in name is to use the rfc2047 syntax:

To: =?ISO-8859-1?Q?Ex=2C_ample?= <to@a.com>

I would like to add the possibility to use the following command lines:

    git send-email --to '"Ex, am ple" <to@a.com>'

    git send-email --to '"Ex, am" "ple" <to@a.com>'

    git send-email --to "\"Ex, am ple\" <to@a.com>"

    git send-email --to "\"Ex, am\" \"ple\" <to@a.com>"

Here are my questions : Is this a good idea to handle commas in name ? Do you have any suggestion about proposed syntaxes ?