(go_daemon): Don't go into daemon mode if in debug mode.

(initialize): Fixed a printf statement.
(main): chdir to param.core_dir before the action starts.
(datafilename): Removed.  All users modified
	to use param.datafile_name instead.
(backupfilename): Removed.  All users modified to use
	param.backupfile_name instead.
(textfilename): Removed.  All users modified to use
	param.textfile_name instead.
(statisticfile, pidfile, memusefile): Removed.  All callers modified
	to use param.statistic_name, param.pid_name and
	param.memuse_name instead.