Should not allow HASH/ARRAY value. bugid:112637

Conflicts:
	lib/MT/XMLRPCServer.pm
is_valid_absolute_path was changed to MT.Validator.absolutePath. BugzID: 112585
Fixed the problem that entry text could not be updated in Safari on iOS when PreviewInNewWindow was effective. BugzID: 112324
The "submitted" flag is not set if the "mt:once" attribute does not exist. BugzID: 112626
Bump up version number. bugid:112648
Merge branch 'internal-hotfix-6.0.6'