Fixes #36 : Omit avatar if messages come from same author
This is simply done by modifying QTdMessage and QTdMessageListModel to be a doubly-linked list. So each message now knows if the next and previous message come from the same author.
This is simply done by modifying QTdMessage and QTdMessageListModel to be a doubly-linked list. So each message now knows if the next and previous message come from the same author.