Added support for complex line end and start rule...

* Added flag s/e/E to LERewriteRule to marke for line start/end/exclusive
  end. Exclusive end excludes the matched string in a line.
* Make use of PCRE_PARTIAL in pcre_exec to allow partial match to reduce
  number of flatten.
* Reduce number of bucket split.
* Added LEVerbose for debug output.