Bug fix: dont know what exactly the bug was. just experimented by merging (svn...

Bug fix: dont know what exactly the bug was. just experimented by merging (svn merge -r 4830:4823 fmatrix.hh) version 4823 and it did work. atleast the fmatrixtest is working. perhaps Markus can point out what the bug was

[[Imported from SVN: r4831]]