* fixes bug in egon_export.py where missing payment date would result in non writing of gml
* fixes bug in egon_export.py which occured due to extension of parcel data fetching
* updates unavailable.html report content, such that users will understand why a recorded entry might not be visible, yet
* adds public report rendering for intervention model
* adds new routes for report
* adds new public_base.html and public_navbar.html
* adds lookup table for zoom levels for lanis link generating
* moves qr code generating into utils/generators.py
