[Kill] Remove the sliding block problem

src/Makefile.am

src/sliding-block-data/boundaryconditions.py

src/sliding-block-data/mybody.hh

src/sliding-block-data/mygeometry.hh

src/sliding-block-data/myglobalfrictiondata.hh

src/sliding-block-data/mygrid.hh

src/sliding-block-data/parset.cfg

src/sliding-block.cc