Add PackageIndex.insert and reverse merge/mappend Packages in the second argument to merge now mask those in the first.
Add PackageIndex.insert and reverse merge/mappend
Packages in the second argument to merge now mask those in the first.

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