minor enhancements

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@5539 2b470e98-0d58-463d-a4d8-8e2adae1ed80
FRM: fix digital-input-message overriding output state

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@5540 2b470e98-0d58-463d-a4d8-8e2adae1ed80