#11 and #3: added more readable REST API for controlled_vocabulary (and also for requests of only one entry))

#11 and #3 (and also #8): provided an API to the controlled vocabulary (as long as no ontology service is in place), also wrote first pytest, but not yet working (settings have to be established in test database), prepared scripts to create pages also documenting the controlled vocabulary (pages: index can still show the source code, which is wanted)

#3: found solution for loading controlled vocabulary only once at start time (with raw database connection); have to put it into place (so that pytests are also running); for now the workaround is still active

created ONE toardb app, also adapted pytests for toardb app (still very last test will throw an error for teardown; inserted example for url percent encoding