fixes to get zwave working
Revert plugin guid vs id mess to original setting of using the guid
Also fix the documentation to make this clear
Initial label support.
Merge remote-tracking branch 'upstream/add_valueid'
Add new versions of the poweron and poweroff callbacks to support
transferring value id's
Support to delete tracked values, different way of implementing the v2 functions for poweron and poweroff.
Fixed control page, updated database schema. Removed useless test value from empty database.
Fix database upgrade code for 0.2 -> 0.3 to also update the control
types
twisted.web.error was deprecated and has now been removed
Cosmetic: fix table header
Cosmetic: increase number of values that can be shown at once
Update thermostat setpoint support with all recent changes
Add dimmer support
Expose label
Update event handling to 
- support dimming
- improve logging
Show id
More room for devices and values
(need to fix the paging bug at a later stage)
Fix naming of zmq configuration items
Fix editing/deleting plugins and make ui consistent with other screens
Fix editing of devices and fix deleting devices with no location