made mlogfilter help texts clearer regarding merging of files.
made mlogfilter help texts clearer regarding merging of files.

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