fhem.html: fixing forum links


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4584 2b470e98-0d58-463d-a4d8-8e2adae1ed80
FHEMWEB: adding floorplan specific iconPath


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4585 2b470e98-0d58-463d-a4d8-8e2adae1ed80
FHEMWEB: check non-existing iconPath only once


git-svn-id: svn://svn.code.sf.net/p/fhem/code@4586 2b470e98-0d58-463d-a4d8-8e2adae1ed80