Added IBAN printing
Added docstrings
Moved language functions to separate module
Various parser bug fixes
Splif off banking features to natural.bank

The features did not yet exist in any release, so only
development installations of natural are now backward
incompatible.
More stuff required for development
Include doctests
Refactored natural.bank
Updated locales
Fixed encoding marker
Translate all available languages
Merged the test suite into doctests