* dependent on the window.location.protocol result, we construct the serverUrl
* for strato ssl-proxy, we hve to insert the 1st part of the window.location.path result

* rename 'haltestelle.getInfo()' method to 'haltestelle.getAbfahrten()'
* move the ajax response processing from the anonymous callback function in the'haltestelle.getAbfahrten()' method into own 'haltestelle.processAbfahrten()' method
* adapt the eventListener to the renaming into the 'haltestelle.getAbfahrten()' method

* if it's empty don't process it and print a message into html
* if there is useful data, process is and print the data as table into html

* check for the origin of the url (with or without www) to select the suitable ajax url to fullfill the same origin policy

* creating an sequence of two-element tuples with the queries gotten from the ajax calling instance
* use that sequence of tuples with the urlencode() method to create the encoded string of queries

* we get a request from the ajax function in the javascript
* we parse the queries of the request
* we send a request with the parsed queries to the vvo server
* we get the data from the vvo server
* we send the data to the requesting ajax function

* we get our data now from a python script on same server as the webpage
* url was changed to our own server
* we must delete one char more at begin and end of the response string

* ajaxCall() function now with parameter for type of response value, available values: "text", "xml" & "json"

some more comments for documentation