`new_catalog` now accepts another argument, `--domain`, which is used to build the output file path, which now is of the form `<output_dir>/<locale>/<domain>.po`, the correct form. Removed the language and coutry arguments of `write_po`, which instead accepts a `babel.core.Locale` object to retrieve the needed object.

include babel/localedata/*.dat
include doc/api/*.*
include doc/*.html