Merge 'D.Compat.Exception' and 'D.Client.Compat.Exception'.

Cabal/Cabal.cabal

Cabal/Distribution/Compat/Exception.hs

cabal-install/Distribution/Client/Compat/Environment.hs

cabal-install/Distribution/Client/Compat/Exception.hs

cabal-install/Distribution/Client/Compat/Semaphore.hs

cabal-install/Distribution/Client/Config.hs

cabal-install/Distribution/Client/IndexUtils.hs

cabal-install/Distribution/Client/Install.hs

cabal-install/Distribution/Client/InstallSymlink.hs

cabal-install/Distribution/Client/JobControl.hs

...install/Distribution/Client/Sandbox/PackageEnvironment.hs

cabal-install/Distribution/Client/Sandbox/Timestamp.hs

cabal-install/Distribution/Client/SetupWrapper.hs

cabal-install/Distribution/Client/Utils.hs

cabal-install/Distribution/Client/World.hs

cabal-install/cabal-install.cabal