fhem.pl: avoid warning messages in eocr-threshold checking


git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6249 2b470e98-0d58-463d-a4d8-8e2adae1ed80
TcpServerUtils.pm: avoid blocking (Forum #24799)


git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6250 2b470e98-0d58-463d-a4d8-8e2adae1ed80
Add Forum #22336 LCars picture to fhem.html


git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@6251 2b470e98-0d58-463d-a4d8-8e2adae1ed80