Add linesbefore/after capturing in lines searching in ocaml...
Add linesbefore/after capturing in lines searching in ocaml...

Plus some other additions and enhancements

clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch,clarkcb/xsearch