change iFrontendInformation api

change iFrontendInformation api
getFrontendData(bool) is now splitted in three seperate calls
getFrontendData() returns the frontend number and frontend type in a dict
getFrontendStatus() return signal quality, signal power, bit error rate,
lock state, sync state, frontend state in a dict
getTransponderData(bool) when the bool is true it returns a dict with the
original tuned transponder data, when false the transponderdata read out
from the frontend driver
getAll(bool) is a sum of the three single calls and the direct replacement
of the old getFrontendData call