Get rid of tr1 support

As discussed on the list. We don't need it anymore, either we have a modern
compiler that supports C++11, or we fall back to boost. I kept and adjusted
the regex #define, since we cannot use std regex completely yet.
Add tex2lyx test for KOMA-Script classes

In the future this test case should contain all KOMA-Script features.
Currently, it tests just \captionabove anmd \captionbelow.