Add config property to deactvate URL-encoding of the parameters passed to the API

[frmichel]

The API of openweathermap.org seems to have a problem with the URL encoding of the '.' as '%2E' in the following:
curl 'http://api.openweathermap.org/data/2.5/weather?lat=43%2E5200&lon=5%2E45000&units=metric&appid=KEY'

But this invocation works:
curl 'http://api.openweathermap.org/data/2.5/weather?lat=43.5200&lon=5.45000&units=metric&appid=KEY'

Solution: add a parameter in the config.ini of a service to deactivate the url-encoding of the parameters.