Tidy up all the default values to be handled by an add_defaults function NOTE: also changed the behaviour of pipework_insulated_fraction to       default to 1 rather than being set to 1 in all cases.
Tidy up all the default values to be handled by an add_defaults function
NOTE: also changed the behaviour of pipework_insulated_fraction to
      default to 1 rather than being set to 1 in all cases.

emoncms/MyHomeEnergyPlanner,emoncms/MyHomeEnergyPlanner,emoncms/MyHomeEnergyPlanner,larkery/MyHomeEnergyPlanner,larkery/MyHomeEnergyPlanner,emoncms/MyHomeEnergyPlanner,larkery/MyHomeEnergyPlanner