Revert "new preconditioners generating matrix hierarchy using transfer operators..."

dune/faultnetworks/dgmgtransfer.hh

.../faultnetworks/preconditioners/cellpatchpreconditioner.hh

...aultnetworks/preconditioners/levelglobalpreconditioner.hh

...faultnetworks/preconditioners/levelpatchpreconditioner.hh

...works/preconditioners/levelpatchpreconditioner_working.hh

...networks/preconditioners/multilevelpatchpreconditioner.hh

.../preconditioners/multilevelpatchpreconditioner_working.hh

...ultnetworks/preconditioners/supportpatchpreconditioner.hh

src/cantorfaultnetworks/cantorfaultnetwork.cc

src/cantorfaultnetworks/cantorfaultnetwork.parset

src/cantorfaultnetworks/results/sparse/compare.txt

src/cantorfaultnetworks/sparsecantorfaultnetwork.cc

src/cantorfaultnetworks/sparsecantorfaultnetwork.parset

src/geofaultnetworks/geofaultnetwork.cc

src/geofaultnetworks/rockfaultnetwork.cc

src/geofaultnetworks/rockfaultnetwork.parset