grapher: change SIGCHLD handling and exit cleanup

The signal handler now calls waitpid() and writes the pid and status
to its pipe.

* grapher.cxx (ChildInfo): new class
  (handleChild): wait for zombies and write their status down the
  pipe.
  (ChildDeathReader::ioCallback): Read dead child's pid from signal
  handler pipe and emit signal.
  (ChildDeathReader::reap): delete
  (ChildDeathReader::Callback): delete
  (StapLauncher::StapLauncher): Connect to childDied signal.
  (StapLauncher setWinParams, reap, cleanUp): delete
  (onChildDied): new function that updates the parsers list when a
  child dies.
  (GrapherWindow): Remove ChildDeathReader::Callback base class
  (GrapherWindow::onParserListChanged): New function; exits if program
  is quitting and no parsers are left.
  (on_menu_file_quit): Kill all children; don't hide (and exit) unless
  there are no parsers.
  (main): Don't do any cleanup after Gtk loop exits.

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