FRM: use eval in FRM_RGB_Set to catch errors

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@4191 2b470e98-0d58-463d-a4d8-8e2adae1ed80
updated plotAsPng() documentation in 02_RSS.pm

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@4192 2b470e98-0d58-463d-a4d8-8e2adae1ed80
autoReadReg after pairing, error for unset IODev

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@4193 2b470e98-0d58-463d-a4d8-8e2adae1ed80
fix issue with DST changes in 57_Calendar.pm

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@4194 2b470e98-0d58-463d-a4d8-8e2adae1ed80
FRM implement dimmer interface for FRM_PWM

git-svn-id: https://svn.code.sf.net/p/fhem/code/trunk@4195 2b470e98-0d58-463d-a4d8-8e2adae1ed80