First pass of email function for lunch notifications.
Fix random number generator.
Fix docstring.
Inline some variables.
Add entries to group size table and convert to lists for consistency with other return types from _calc_lunc_group_sizes.
Import and use the copy function correctly.
Add __repr__ to LunchGroup.
Format takes kwargs not a dict!
Fix style and indentation in email sending.
Fix email to work for multiple recipients.