33_readingsGroup.pm: properly detect ! flag in notify, reset device name after each reading@device element


git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@7066 2b470e98-0d58-463d-a4d8-8e2adae1ed80
MAX: more robustness checks

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@7067 2b470e98-0d58-463d-a4d8-8e2adae1ed80
MAX: more robustness checks

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@7068 2b470e98-0d58-463d-a4d8-8e2adae1ed80