* if we got no data from the server in the haltestelle.processabfahrten() method, we call haltestelle.getHaltestellen() method
* when we got data from the server in the haltestelle.getHaltestellen() method, we call the haltestelle.processHaltestellen() method
* in the haltestelle.processHaltestellen() method we process the gotten data and print it into the output area of the html file
begin to develop support for getting station names
* new query: query which contains the wished server script to call
* query can contain 'haltestelle.do' or 'abfahrten.do'
* all other values are rejected and answered with empty array
begin to develop support for getting station names
* new method haltestelle.getHaltestellen() to get the station names from the server
* new method haltestelle.processHaltestellen() to process the received station names
* event handler registration for haltestelle.getHaltestellen() method
* 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
encode queries before use them with the url in the urlopen() method
* 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
python script to get the vvo data and send it to the calling ajax js
* 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