add auto centre diff and correct time estimate on stxm#63

Relm-Arrowny wants to merge 12 commits intomainDiamondLightSource/sm-bluesky:mainfrom

61-put-beam-onto-the-centre-of-diffractometerDiamondLightSource/sm-bluesky:61-put-beam-onto-the-centre-of-diffractometerCopy head branch name to clipboard