o extract_python fixes: - now returns None for non-string arguments - no longer extracts strings from nested function calls refs #38 - use the correct starting line number in multi-line gettext function calls - avoids falsely identifying string keyword arg defaults from function definition names that match a keyword, e.g.: def gettext(foo='bar') - avoid capturing translator comments embedded within a gettext function call - default the file encoding to iso-8859-1 instead of ascii when missing a magic encoding comment, to emulate pre Python 2.5 behavior. Python warns about 'non-ascii' chars when there is no magic encoding comment, but < 2.5 actually treats them as iso-8859-1 for backwards compat (PEP 263). >= 2.5 treats them as strict ascii o extract fixes: - filter out messages that don't contain strings where the keyword specification calls for fixes #39 - filter out empty string messages and emit a warning about them, like xgettext

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