* Doxyfile.in (PREDEFINED): put DOXYGEN_SHOULD_SKIP_THIS in
	Doxyfile.in, not Doxyfile

	* dbus/dbus-keyring.c: do some hacking on this

	* dbus/dbus-sysdeps.c (_dbus_delete_file): new

	* dbus/dbus-errors.c (dbus_set_error_const): do not call
	dbus_error_init
	(dbus_set_error): remove dbus_error_init, check for message ==
	NULL *before* we sprintf into it, and add @todo about including
	system headers in this file

	* dbus/dbus-sysdeps.c (_dbus_create_file_exclusively): new

	* dbus/dbus-errors.h (DBUS_ERROR_FAILED): add

	* dbus/dbus-sysdeps.c (get_user_info): break this function out to
	get various bits of user information based on either username
	or user ID
	(_dbus_homedir_from_username): new function