[Cleanup] Rename: sand-wedge -> one-body-problem

src/CMakeLists.txt

src/hdf5/patchinfo-writer.hh

src/one-body-problem-data/bc.hh

src/one-body-problem-data/geometry.tex

src/one-body-problem-data/midpoint.hh

src/one-body-problem-data/mybody.hh

src/one-body-problem-data/mygeometry.cc

src/one-body-problem-data/mygeometry.hh

src/one-body-problem-data/myglobalfrictiondata.hh

src/one-body-problem-data/mygrid.cc

src/one-body-problem-data/mygrid.hh

src/one-body-problem-data/mygrid_tmpl.cc

src/one-body-problem-data/parset-2D.cfg

src/one-body-problem-data/parset-3D.cfg

src/one-body-problem-data/parset.cfg

src/one-body-problem-data/patchfunction.hh

src/one-body-problem-data/segmented-function.hh

src/one-body-problem-data/weakpatch.hh

src/one-body-problem.cc

src/uniform-grid-writer.cc