10_EIB.pm: ABU 20160122 fixed doku, changed return value for EIB_Set from undef to "", reintegrated multiple group sending
10_EIB.pm: ABU 20160122 fixed doku, changed return value for EIB_Set from undef to "", reintegrated multiple group sendingView Changes
Source: 10_EIB.pm: ABU 20160122 fixed doku, changed return value for EIB_Set from undef to "", reintegrated multiple group sending (http://sourceforge.net/p/fhem/code/10599/)