Show '--config-file' in 'cabal help' output.
Show '--config-file' in 'cabal help' output.

Fixes #1113.

bennofs/cabal,seereason/cabal,mightybyte/cabal,lukexi/cabal,randen/cabal,gridaphobe/cabal,kolmodin/cabal,plumlife/cabal,eric-stanley/cabal,thomie/cabal,bennofs/cabal,sopvop/cabal,sopvop/cabal,sopvop/cabal,plow-technologies/cabal,kosmikus/cabal,kosmikus/cabal,triplepointfive/cabal,martinvlk/cabal,Helkafen/cabal,x-y-z/cabal,corngood/cabal,edsko/cabal,anton-dessiatov/cabal,fugyk/cabal,triplepointfive/cabal,lukexi/cabal,themoritz/cabal,Helkafen/cabal,corngood/cabal,rimmington/cabal,ian-ross/cabal,beni55/cabal,christiaanb/cabal,eric-stanley/cabal,Peaker/cabal,christiaanb/cabal,ian-ross/cabal,mmakowski/cabal,martinvlk/cabal,garetxe/cabal,themoritz/cabal,trskop/cabal,Heather/cabal,rimmington/cabal,mmakowski/cabal,valderman/cabal,gridaphobe/cabal,anton-dessiatov/cabal,kolmodin/cabal,beni55/cabal,valderman/cabal,fpco/cabal,thomie/cabal,thoughtpolice/cabal,ghc-android/cabal,gbaz/cabal,randen/cabal,trskop/cabal,headprogrammingczar/cabal,thoughtpolice/cabal,typelead/epm,mightybyte/cabal,mydaum/cabal,ghc-android/cabal,enolan/cabal,typelead/epm,gbaz/cabal,x-y-z/cabal,fugyk/cabal,plow-technologies/cabal,garetxe/cabal,Heather/cabal,fpco/cabal,seereason/cabal,enolan/cabal,themoritz/cabal,plumlife/cabal,headprogrammingczar/cabal,Peaker/cabal,mydaum/cabal,edsko/cabal