Patch to send password reminders per-list.

[Mark Sapiro]

Password reminders are sent with a single reminder email for all lists in a domain for which a user is receiving reminders. Thus there is no list context for the reminder, and a list specific version of the cronpass.txt reminder template isn't consulted. This is an issue for some installations who want a list specific reminder.

This patch modifies cron/mailpasswds to send reminders individually per list and will allow a list specific cronpass.txt template to work for the reminders. This will not become a standard feature as it is too annoying to people who are members of multiple lists in the installation.