Teahouse answerers username lookup

This table contains the parsed username (from `td_firstfiltered`), the current or corrected username, and the correct user id for each user. 

If you join this table with the table `td_host_profiles`, you can get a more accurate census of all answerers who have created  a host profile, even if due to parsing error or username change we had previously failed to identify that user as a host.

- Sometimes a user has changed their username, resulting in some of their answers not being attributed to the right user. (Example: 'SarahStierch' is now 'Missvain', She has answered questions under both usernames, but these are being attributed to two different users.
- Sometimes the parsed username in the table `td_firstfiltered` does not match any known username because of parsing errors (particularly initial capitalization, e.g. 'giwickwire' should actually be 'Gwickwire'), causing us to fail to identify that user as a host.

Note that if a user's name has been changed and they answered questions under both usernames, they will have two different rows in this table. The values of uname_parsed will be different, but user_name and user_id will be identical.
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