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- Follow Debian repository to git.
- Upgrade data to revision 770fa9cd603f90f9fb982b32fe6f45d253f1d33e as
requested by 5488 and others.
- Reflect subdivision changes with how they reference their parents in the XML
(they used to use space as a separator but now use a hyphen).
- Refactor index building structures a bit.
- Remove superfluous 'code' index from subdivision database. (Together with
the data upgrade this also gets rid of all the annoying warnings as
described in 6667).
- Some light PEP 8 improvements.