tab: add missing methods
tab: add missing methods

This makes `Tab` compatible with `BuildOptions`.

AnastasiaSulyagina/brew,hanxue/linuxbrew,Homebrew/brew,reitermarkus/brew,MikeMcQuaid/brew,mahori/brew,muellermartin/dist,hanxue/linuxbrew,maxim-belkin/brew,amar-laksh/brew_sudo,pseudocody/brew,alyssais/brew,EricFromCanada/brew,gregory-nisbet/brew,vitorgalvao/brew,JCount/brew,reitermarkus/brew,DomT4/brew,toonetown/homebrew,tonyg/homebrew,jmsundar/brew,sjackman/homebrew,aw1621107/brew,tonyg/homebrew,reelsense/brew,konqui/brew,AnastasiaSulyagina/brew,palxex/brew,Linuxbrew/brew,gregory-nisbet/brew,reitermarkus/brew,gordonmcshane/homebrew,vitorgalvao/brew,vitorgalvao/brew,gregory-nisbet/brew,toonetown/homebrew,palxex/brew,gordonmcshane/homebrew,zmwangx/brew,ilovezfs/brew,mahori/brew,amar-laksh/brew_sudo,reelsense/brew,mgrimes/brew,claui/brew,DomT4/brew,EricFromCanada/brew,muellermartin/dist,mahori/brew,mahori/brew,Linuxbrew/brew,nandub/brew,mgrimes/brew,aw1621107/brew,zmwangx/brew,rwhogg/brew,jmsundar/brew,muellermartin/dist,mgrimes/brew,nandub/brew,JCount/brew,alyssais/brew,bfontaine/brew,sjackman/homebrew,ilovezfs/brew,palxex/brew,konqui/brew,rwhogg/brew,JCount/brew,vitorgalvao/brew,claui/brew,ilovezfs/brew,Linuxbrew/brew,EricFromCanada/brew,toonetown/homebrew,alyssais/brew,bfontaine/brew,amar-laksh/brew_sudo,claui/brew,maxim-belkin/brew,DomT4/brew,bfontaine/brew,JCount/brew,Homebrew/brew,Homebrew/brew,zmwangx/brew,reelsense/brew,maxim-belkin/brew,MikeMcQuaid/brew,DomT4/brew,gordonmcshane/homebrew,sjackman/homebrew,pseudocody/brew,tonyg/homebrew,nandub/brew,rwhogg/brew,jmsundar/brew,Homebrew/brew,aw1621107/brew,Linuxbrew/brew,reitermarkus/brew,AnastasiaSulyagina/brew,claui/brew,konqui/brew,nandub/brew,konqui/brew,EricFromCanada/brew,MikeMcQuaid/brew,hanxue/linuxbrew,sjackman/homebrew,pseudocody/brew,MikeMcQuaid/brew