change interactive calc to `refine calc` (#203)
change interactive calc to `refine calc` (#203)


fpvandoorn/lean,dselsam/lean,leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,dselsam/lean,digama0/lean,leanprover-community/lean,dselsam/lean,fpvandoorn/lean,digama0/lean,digama0/lean,digama0/lean,leanprover-community/lean,fpvandoorn/lean,dselsam/lean,leanprover-community/lean,leanprover-community/lean,dselsam/lean,digama0/lean,dselsam/lean,leanprover-community/lean,digama0/lean,fpvandoorn/lean