.. introduce concept of configChanged(what) to
pass details of what config has been changed
.. fixed zones changes to re-read after write
to correct the save twice to get changes to
zones bug.
.. next parts need to spot changes (part 2) and
then action appropriately (part 3)
.. its been there since the beginning at the heart of the code
as a registry of the rides (RideItem) and controlling the
selection of rides.
.. in v3.0 we stopped showing it, but it was still created and
then hidden immediately. But removing the 'spine' of the code
was seen as a step too far.
.. this is the first part of moving from SQL to a NoSQL cache
for ride metrics, metadata and measures -- RideItem is now
no longer inheriting from QTreeWidgetItem with all the issues
that brings.
.. since its right at the heart there are likely to be unforeseen
bugs as we go, especially since it affects the ride navigator.
.. add/delete has been tested a fair amount and should be reliable.
