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Clean up whitespace.
Increase maximum length of subreddit name in autolinking.
/r/t:heatdeathoftheuniverse is 24 characters (including t: prefix)
and wasn't being autolinked.
Fix /r/subreddit_with_underscores test breaking with stricter validator.
The validator now checks maximum subreddit name length, this one is too
Add some failing tests for @nandhp's work to fix.