Selecting a date range in the average errors per day graph should change the most common problems table to the matching date range

[Evan]

Selecting a date range in the average errors per day graph by selection a portion of the smaller graph window should change the most common problems table to "most common problems in the date range" and update the table to reflect that range.

[Matthew Paul Thomas (mpt)]

<https://wiki.ubuntu.com/ErrorTracker?action=diff&rev2=102&rev1=101>: "Once at least six months of data has been recorded, the main graph should be followed by a thumbnail navigation graph for selecting a date range. If you do this, the filter controls for the table should change to the same date range, though the reverse should not happen (entering a date range by date should not change the main graph)."