When a cell in the treemap plot is clicked they are displayed
in the popup pane also used by the LTM charts.
We do need to tart up the popup, but at least now the treemap
plot does something meaningful.
Fixes#364.
The treemap chart was developed as a variation of an LTM
chart and as a results has the same chart settings etc.
It has now been refactored to be a standalone chart with
no need to re-use the LTM settings and code.
This is also in preparation to support click through on
the cells to show a popup of rides.
Lots of nitty fixups, largely for uninitialised temporary
variables.
I have left the use of boost::function and boost::bind in the
DownloadRideDialog alone, so it will vomit when compiled
with boost 1.46 and gcc 4.5 or higher. Will look into this
more carefully at a later stage.
I am working up to resolving issues identified from -pedantic next.
The recent fix for date range selection was not applied to the
TreeMap plot and caused a SEGV on restart (when placed on home
window). This fixes that.
It also fixes a minor cosmetic related to QFrame margins.
