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The primary purpose of this commit is to rectify most problems with `gsub` (and also `sub` with the `g` option), in particular fix #1425 ('\b'), fix #2354 (lookahead), and fix #2532 (regex == `"^(?!cd ).*$|^cd "`). This commit also partly resolves #2148 and resolves #1206 in that `gsub` no longer loops infinitely; however, because the new `gsub` depends critically on `match/2`, the behavior when regex == `""` is sometimes non-standard. The documentation has been updated to reflect the fact that `sub` and `gsub` are intended to be regular in the second argument. Also, `_nwise/1` has been tweaked to take advantage of TCO.