adding front-part of Autocompleter

I have implemented the front part of the autocompleter-function, and a minimal backend part which return testresults for testing.

To do not affect the program with this beta fuctionality, I have added a config line to deactivate the autocompleter at default.

@asciimoo The backend part, which get the results from google,... must program a different programmer, because I don't understand the search-code. But I think, most of that is already done, so it should be no problem.

thx, pointhi