Add support for reading errors from UBA.

My UBA doesn't answer to this request, though...
Add support for reading contact info.

Seems unsupported on RC30.
Add bus component version reading.
Add support for setting UBA pump delay.
Fix date parsing.

We expect YYYY-MM-DD, not DD-MM-YYYY.
Add helper method for parsing a single int parameter.
Add better support for 'Zirkulation' sensor.