Proposal: Remove Control.Concurrent{QSem,QSemN,,SampleVar,mergeIO,nmergeIO} from base

Hi all, I propose that we remove Control.Concurrent.QSem Control.Concurrent.QSemN Control.Concurrent.SampleVar Control.Concurrent.mergeIO Control.Concurrent.nmergeIO from base. Rationale: There is no real need for them to be in base, and they are not being well-maintained there (e.g. see [3160]). Chris Kuklewicz has already made a SafeSemaphore package that provides fixed versions of the 3 modules. Patch is attached (but basically it just removes the above). Suggested discussion deadline: Fri 22 June 2012. [3160] http://hackage.haskell.org/trac/ghc/ticket/3160 Thanks Ian