New feature added - search next opens invisible area

Hi Vegard, I have been tied for awhile that the 'n/N' commands are not able to open the folded text in org-mode, or not able to open the folded invisible souce code in C/C++ mode. Finally I added this feature so that if "search-invisible" is "open" the "n/N" commands will be able to open an invisible area when the match enters that area, at the same time re-close the previouly opened invisible area the match has just moved away from (provided that the subsequent 'n/N' is pressed within "vimpulse-flash-delay" and no "non-search" commands had been executed between the two "n/N" commands). I added this because I believe that Evil will have the same problem (if it hasn't been handled yet). Please find attached my patch file. Thanks, York