added mlogvis performance improvements to CHANGES.
added mlogvis performance improvements to CHANGES.

gormanb/mtools,rueckstiess/mtools,aerrami/mtools,gormanb/mtools,tomzhang/mtools,ces0712/mtools,corymintz/mtools,gormanb/mtools,tomzhang/mtools,parkhyeonghwa/mtools,devkev/mtools,corymintz/mtools,aerrami/mtools,yaowenqiang/mtools,tomzhang/mtools,parkhyeonghwa/mtools,yaowenqiang/mtools,aerrami/mtools,ces0712/mtools,corymintz/mtools,ces0712/mtools,devkev/mtools,devkev/mtools,yaowenqiang/mtools,parkhyeonghwa/mtools,rueckstiess/mtools