module: added community bug-fixes and module documentation


git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@6932 2b470e98-0d58-463d-a4d8-8e2adae1ed80
PROPLANTA: Small fixes

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@6933 2b470e98-0d58-463d-a4d8-8e2adae1ed80
MYSENSORS_DEVICE: fix crash on unmapped C_REQ-message

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@6934 2b470e98-0d58-463d-a4d8-8e2adae1ed80