Expand message section by default
Added human friendly date function that returns array of human friendly date strings from an epoch
Added human friendly date function that returns array of human friendly date strings from an epoch
Added function to generate a summary line from subject and body, better than listing summary function
Removed duplicate function dialogue_get_humanfriendly_dates(), some how had copied again
Major rewrite of conversation listing, no more view by role. Added option to display by student