[1p][1pnc] Rename tests and folders

test/porousmediumflow/1p/implicit/CMakeLists.txt

.../porousmediumflow/1p/implicit/compressible/CMakeLists.txt

...flow/1p/implicit/compressible/instationary/CMakeLists.txt

...smediumflow/1p/implicit/compressible/instationary/main.cc

...umflow/1p/implicit/compressible/instationary/params.input

...diumflow/1p/implicit/compressible/instationary/problem.hh

...ow/1p/implicit/compressible/instationary/spatialparams.hh

...umflow/1p/implicit/compressible/stationary/CMakeLists.txt

...ousmediumflow/1p/implicit/compressible/stationary/main.cc

...diumflow/1p/implicit/compressible/stationary/params.input

...mediumflow/1p/implicit/compressible/stationary/problem.hh

...flow/1p/implicit/compressible/stationary/spatialparams.hh

.../porousmediumflow/1p/implicit/fracture2d3d/CMakeLists.txt

...ediumflow/1p/implicit/fracture2d3d/grids/fracture2d3d.msh

test/porousmediumflow/1p/implicit/fracture2d3d/main.cc

test/porousmediumflow/1p/implicit/fracture2d3d/params.input

test/porousmediumflow/1p/implicit/fracture2d3d/problem.hh

...orousmediumflow/1p/implicit/fracture2d3d/spatialparams.hh

...orousmediumflow/1p/implicit/incompressible/CMakeLists.txt

test/porousmediumflow/1p/implicit/incompressible/main.cc