(Bug 50122) Removed fragile lookahead in inline_breaks + improve perf.

* Removed the fragile 200-char lookahead in inline_breaks to detect
  breaks inside table. It broke parsing on the page as reported in
  the bug. Re-implemented the simple-regexp as a for-loop on the
  input string without a substr.

* http://localhost:8000/ptwiki/Albert_Einstein?oldid=39283789
  now has a good looking infobox.

Change-Id: I1a837431a65da7d7ce7fa03dd35a61d6c74493fd
Removed dead code from tokenizer utils.

Change-Id: I96a6644a8ceb4b85a31f357b6a91740692f63176