improved help text for mplotqueries new --color option.
improved help text for mplotqueries new --color option.

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