Avoid use of == and != in favor of === and !== 

The == and != operators do type coercion before comparing. This is bad
because it causes ' \t\r\n' == 0 to be true. This can mask type errors.
It is best to not use == and != and to always use the more reliable ===
and !== operators instead.
 Sections of code should not be "commented out"
Each statement must end with a semicolon
Change OSM TileServer URL to maps.deutsche-digitale-bibliothek.de
Merge branch 'APD-98-BOZ' into develop