#143 True "last N days" parsing

[Poromenos]

There should be a display from-to dates option. I have a
huge log which has various channels in it (I separate
them later using grep) and I don't want to display certain
chats before a certain date, I only want chats since
August 15th to today. It would be nice if there was an
option that took a date and displayed chats since that
date, and another that displayed from the beginning to
the ending date.