add 'Since' annotations and remove an unneeded import
add 'Since' annotations and remove an unneeded import

mettekou/ghc,mcschroeder/ghc,ryantm/ghc,ghc-android/ghc,ml9951/ghc,olsner/ghc,gcampax/ghc,siddhanathan/ghc,gridaphobe/ghc,ml9951/ghc,forked-upstream-packages-for-ghcjs/ghc,tibbe/ghc,mcschroeder/ghc,snoyberg/ghc,nkaretnikov/ghc,sgillespie/ghc,da-x/ghc,shlevy/ghc,mfine/ghc,wxwxwwxxx/ghc,lukexi/ghc,olsner/ghc,lukexi/ghc,oldmanmike/ghc,jstolarek/ghc,tibbe/ghc,tjakway/ghcjvm,sdiehl/ghc,da-x/ghc,siddhanathan/ghc,TomMD/ghc,olsner/ghc,mettekou/ghc,olsner/ghc,urbanslug/ghc,da-x/ghc,ghc-android/ghc,elieux/ghc,AlexanderPankiv/ghc,fmthoma/ghc,shlevy/ghc,snoyberg/ghc,wxwxwwxxx/ghc,siddhanathan/ghc,GaloisInc/halvm-ghc,green-haskell/ghc,da-x/ghc,elieux/ghc,nathyong/microghc-ghc,acowley/ghc,sdiehl/ghc,acowley/ghc,gcampax/ghc,oldmanmike/ghc,mettekou/ghc,spacekitteh/smcghc,forked-upstream-packages-for-ghcjs/ghc,gridaphobe/ghc,wxwxwwxxx/ghc,anton-dessiatov/ghc,ezyang/ghc,forked-upstream-packages-for-ghcjs/ghc,nkaretnikov/ghc,lukexi/ghc,lukexi/ghc,ezyang/ghc,gridaphobe/ghc,gridaphobe/ghc,gridaphobe/ghc,anton-dessiatov/ghc,urbanslug/ghc,nkaretnikov/ghc,anton-dessiatov/ghc,vTurbine/ghc,fmthoma/ghc,ryantm/ghc,olsner/ghc,nathyong/microghc-ghc,elieux/ghc,snoyberg/ghc,vTurbine/ghc,green-haskell/ghc,spacekitteh/smcghc,tjakway/ghcjvm,mfine/ghc,ghc-android/ghc,nathyong/microghc-ghc,wxwxwwxxx/ghc,wxwxwwxxx/ghc,da-x/ghc,mfine/ghc,wxwxwwxxx/ghc,sgillespie/ghc,tjakway/ghcjvm,nushio3/ghc,nathyong/microghc-ghc,fmthoma/ghc,mfine/ghc,green-haskell/ghc,christiaanb/ghc,mcschroeder/ghc,GaloisInc/halvm-ghc,AlexanderPankiv/ghc,ml9951/ghc,anton-dessiatov/ghc,AlexanderPankiv/ghc,elieux/ghc,olsner/ghc,vTurbine/ghc,ml9951/ghc,gridaphobe/ghc,fmthoma/ghc,urbanslug/ghc,vikraman/ghc,frantisekfarka/ghc-dsi,shlevy/ghc,snoyberg/ghc,nkaretnikov/ghc,gcampax/ghc,urbanslug/ghc,mfine/ghc,green-haskell/ghc,mcschroeder/ghc,vikraman/ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,frantisekfarka/ghc-dsi,christiaanb/ghc,AlexanderPankiv/ghc,tibbe/ghc,olsner/ghc,nushio3/ghc,frantisekfarka/ghc-dsi,elieux/ghc,oldmanmike/ghc,frantisekfarka/ghc-dsi,vikraman/ghc,oldmanmike/ghc,acowley/ghc,ryantm/ghc,AlexanderPankiv/ghc,acowley/ghc,bitemyapp/ghc,shlevy/ghc,acowley/ghc,sgillespie/ghc,TomMD/ghc,nushio3/ghc,GaloisInc/halvm-ghc,ghc-android/ghc,christiaanb/ghc,elieux/ghc,mfine/ghc,bitemyapp/ghc,shlevy/ghc,christiaanb/ghc,fmthoma/ghc,nathyong/microghc-ghc,spacekitteh/smcghc,GaloisInc/halvm-ghc,oldmanmike/ghc,mcschroeder/ghc,jstolarek/ghc,ryantm/ghc,gcampax/ghc,forked-upstream-packages-for-ghcjs/ghc,gridaphobe/ghc,nathyong/microghc-ghc,snoyberg/ghc,ezyang/ghc,holzensp/ghc,tjakway/ghcjvm,shlevy/ghc,GaloisInc/halvm-ghc,nushio3/ghc,gcampax/ghc,nushio3/ghc,holzensp/ghc,fmthoma/ghc,ml9951/ghc,christiaanb/ghc,tibbe/ghc,siddhanathan/ghc,oldmanmike/ghc,nkaretnikov/ghc,vikraman/ghc,nkaretnikov/ghc,ghc-android/ghc,vTurbine/ghc,elieux/ghc,holzensp/ghc,snoyberg/ghc,nathyong/microghc-ghc,mettekou/ghc,da-x/ghc,TomMD/ghc,bitemyapp/ghc,mettekou/ghc,vTurbine/ghc,tjakway/ghcjvm,da-x/ghc,holzensp/ghc,ml9951/ghc,mettekou/ghc,lukexi/ghc,mfine/ghc,ml9951/ghc,ghc-android/ghc,ezyang/ghc,green-haskell/ghc,urbanslug/ghc,GaloisInc/halvm-ghc,mcschroeder/ghc,TomMD/ghc,AlexanderPankiv/ghc,tibbe/ghc,siddhanathan/ghc,nushio3/ghc,sgillespie/ghc,christiaanb/ghc,forked-upstream-packages-for-ghcjs/ghc,ghc-android/ghc,anton-dessiatov/ghc,anton-dessiatov/ghc,urbanslug/ghc,sgillespie/ghc,spacekitteh/smcghc,christiaanb/ghc,ezyang/ghc,tjakway/ghcjvm,acowley/ghc,vTurbine/ghc,siddhanathan/ghc,GaloisInc/halvm-ghc,gcampax/ghc,vikraman/ghc,shlevy/ghc,sdiehl/ghc,forked-upstream-packages-for-ghcjs/ghc,forked-upstream-packages-for-ghcjs/ghc,frantisekfarka/ghc-dsi,oldmanmike/ghc,sgillespie/ghc,nkaretnikov/ghc,nushio3/ghc,vikraman/ghc,ryantm/ghc,urbanslug/ghc,TomMD/ghc,mcschroeder/ghc,TomMD/ghc,sdiehl/ghc,bitemyapp/ghc,TomMD/ghc,ml9951/ghc,sdiehl/ghc,siddhanathan/ghc,sgillespie/ghc,gcampax/ghc,wxwxwwxxx/ghc,vTurbine/ghc,acowley/ghc,jstolarek/ghc,fmthoma/ghc,mettekou/ghc,sdiehl/ghc,vikraman/ghc,holzensp/ghc,jstolarek/ghc,anton-dessiatov/ghc,jstolarek/ghc,ezyang/ghc,spacekitteh/smcghc,snoyberg/ghc,ezyang/ghc,sdiehl/ghc,bitemyapp/ghc