(This Jan. 20 story has been corrected to say Brandenburg, not Mecklenburg-Western Pomerania, in paragraph 3) By Andreas Rinke BERLIN (Reuters) – German right-wing conservative group Werteunion (Values Union) said on Saturday it had decided to found a new political party, adding to a fragmentation of the previously stable spectrum of parties in the country. Members of the group gave Chairman Hans-Georg Maassen, in a closed party meeting in the city of Erfurt, a mandate by a large majority to initiate the founding of a “conservative-liberal” party, according to a statement from the group. Maass…