- New rpm had removed "prereq" flag from installation script bits
that is that `Requires(prereq)' is not valid anymore :(((

- Asymptote binaries may have the same version as the format files
of the asymptote package it self (bnc#813032)

- Change Obsoletes from < 2012+subversion to <= 2011 (bnc#811162)
- Let mathdesign require tex(texnansi.enc) (bnc#808731)
- Let biber-bin require perl(Text::BibTeX) (bnc#811258)
- Do not require xfs as we do not use xfs at all, otherwise we
have to add some more lua code in the %post scriptlet.