UConv.pm: add pre-defined combined valute+unit variables value_unit_long and value_unit
UConv.pm: add pre-defined combined valute+unit variables value_unit_long and value_unitView Changes
Source: UConv.pm: add pre-defined combined valute+unit variables value_unit_long and value_unit (https://sourceforge.net/p/fhem/code/12495/)