scrpage2 obsolete

[Ivo Pletikosić]

scrpage2 is now obsolete, scrlayer-scrpage should be used instead http://tug.ctan.org/macros/latex/contrib/koma-script/doc/scrpage2.pdf

[André Miede]

Replaced/updated scrpage2 with scrlayer-scrpage in classicthesis.sty (seems to work easily).

Full potential of scrlayer-scrpage has to be evaluated for future versions and/or the re-implementation.

[Ivo Pletikosić]

Check also the whole layer paradigm of KOMA-Script for the reimplementation.