[2p] port non-isothermal tests

dumux/porousmediumflow/nonisothermal/implicit/indices.hh

test/porousmediumflow/2p/implicit/CMakeLists.txt

...porousmediumflow/2p/implicit/nonisothermal/CMakeLists.txt

test/porousmediumflow/2p/implicit/nonisothermal/problem.hh

...orousmediumflow/2p/implicit/nonisothermal/test_2pni.input

...orousmediumflow/2p/implicit/nonisothermal/test_box2pni.cc

...porousmediumflow/2p/implicit/nonisothermal/test_cc2pni.cc

test/porousmediumflow/2p/implicit/test_box2pni.input

.../porousmediumflow/2p2c/implicit/injectionspatialparams.hh