seq:preparing export for reversed iterator+bugfix;fixing bug in alignment...

seq:preparing export for reversed iterator+bugfix;fixing bug in alignment where last col would not be accessible

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2208 5a81b35b-ba03-0410-adc8-b2c5c5119f08