Changelog for process-1.2.2.0

Changelog for `process` package

Fix delegated CTRL-C handling in createProcess in case of failed process creation. See issue #15 for more details.
waitpid on child PID after pre-exec failure in child to prevent zombies. See also issue #14.

Add support for base-4.8.0.0
Remove Hugs98 specific code
New IsString CmdSpec instance
Expose documentation for System.Process.Internals
With GHC 7.10, System.Cmd and System.Process are now Safe (when compiled with older GHC versions they are just Trustworthy)
Expose createProcess_ function, and document behavior of UseHandle for createProcess. See issue #2.
New System.Process.createPipe operation. See also GHC #8943

Update to Cabal 1.10 format
Remove NHC specific code
Add support for base-4.7.0.0
Improve showCommandForUser to reduce redundant quoting
New functions callProcess, callCommand, spawnProcess and spawnCommand
Implement WCE handling according to http://www.cons.org/cracauer/sigint.html
New delegate_ctlc field in CreateProcess for WCE handling
Use ExitFailure (-signum) on Unix when a proc is terminated due to a signal.
Deprecate module System.Cmd
On non-Windows, the child thread now comunicates any errors back to the parent thread via pipes.
Fix deadlocks in readProcess and readProcessWithExitCode