Add stats to private quizes in FunTriva

v1.15 Added line in table to mark average
v1.10 Improved graph, added fill and #entries options for graph.
v1.4 Added graph title.
v1.3 Tidies up page a fair bit, removing stuff that isn't used and moving other stuff around.
v1.1 Can click to hide/show graph lines
v1.0 Configurable graph and display. Two graph types - scores (absolute) and adjusted (relative to daily average).
v0.9 adds graphs of daily stats
v0.2 adds 'daily' stats for the logged in user