Removed author notice, it destroys the diff
Fixed various mistakes with unicode characters
Updated polish characters (needs verification)
Updated subdivision codes for Australia

see http://de.wikipedia.org/wiki/ISO_3166-2:AU
Updated file description and sources
Make IsotopeBackend::getSubdivisions method static and cache results
Use the IsotopeBackend method to load subdivisions
Implemented second level for subdivisions
Added second level subdivisions for Great Britain
According to Wikipedia, this subdivision should not have a space in the name
Revert "Updated polish characters (needs verification)"

This reverts commit affbc236cc557455f91ddf0093d45179058bb7e8.
Merge branch 'feature/subdivisions-update' into develop