fhem: added support for soil moisture meter

added Wheather.Humidity message
added auto device detection
update documentation
fhem: added Rx support new PowerSwitch messages

reception of DigitalPortTimeout
autoassign devtype
adjust state format
fhem: added support to set DigitalPins and DigitalPorts

also DigitalPinTimeout and DigitalPortTimeout
fhem: convert deprecated SwitchState messages
fhem: use pin & port instead of din & dins
fhem: update documentation
Merge pull request #114 from Roadyweb/fhem_update

Fhem update