fixing not properly working redefines


git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3125 2b470e98-0d58-463d-a4d8-8e2adae1ed80
  - enhanced performance for charts
  - better axis title handling

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@3126 2b470e98-0d58-463d-a4d8-8e2adae1ed80