- rename User- to TimelineExtractor
- rename 'userid' to 'user_id' to conform to the other ..._id values
- adjust archive_fmt to deal with retweets
- emulate browser behavior for API calls
This commit mostly replaces all minus-signs ('-') in keyword names with
underscores ('_') to allow them to be used in filter-expressions. For
example 'gallery-id' got renamed to 'gallery_id'.
(It is theoretically possible to access any variable, regardless of its
name, with 'locals()["NAME"]', but that seems a bit too convoluted if
just 'NAME' could be enough)
