Deprecate SQL metricDB

.. removes across the code base

.. need to fixup RideFileCache and Lucene refresh
   within the RideItem/RideCache framework, they will
   NOT be refreshed at present

.. need to look at how charts get refreshed on data
   changes now RideItem provides a more granular
   mechanism (look for XXXREFRESH in code)

.. New Intervals code will definitely NOT compile
   and needs to be redesigned/reimplemented to fit
   in with the ride cache