ellipsize_to_word: trim extra end ws. new funcs: ymd_to_d(), get_in_reply_to_urls().

new functions ymd_to_d() and get_in_reply_to_urls() (looks for actual
"in-reply-to:" and URL in post text - Falcon backcompat).
ellipsize_to_word now trims *extra* (more than one) space/return
character at the end after truncating for any other reasons (length,
punctuation etc.)