busitem.py: replaced tracing module with logging, and made it less verbose
settingsdevice.py: cleaned it up, and broke the API while doing this.
added VeDbusItemImport.exists and VeDbusItemImport.SetValue()
settingsdevice.py is no longer relying on busitem.py, only vedbus.py. And added function to change setting
Implemented local cache for imported D-Bus values
when com.victronenergy.settings does not exist, you now get a understandable error
Merge branch 'master' of https://github.com/victronenergy/velib_python
Reinstated spacing as used in the original file; revert back to blocking requests if pool is not available
Added documentation
Merge branch 'master' of https://github.com/victronenergy/velib_python
Added documentation about the origin of the Pubnub.py file