added  CXXflags -DEIGENNO_DEBUG :removes checks for conformability (which gives a speedup in eigen)
added  CXXflags -Wextra: adds adittional check (see http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html for more info)





git-svn-id: svn://svn.r-forge.r-project.org/svnroot/genabel@1596 edb9625f-4e0d-4859-8d74-9fd3b1da38cb