Rename Problem-TypeTags to end in TypeTag in folders test and tutorial.

test/freeflow/navierstokes/angelitestproblem.hh

test/freeflow/navierstokes/channeltestproblem.hh

test/freeflow/navierstokes/closedsystemtestproblem.hh

test/freeflow/navierstokes/doneatestproblem.hh

test/freeflow/navierstokes/kovasznaytestproblem.hh

test/freeflow/navierstokes/test_angeli.cc

test/freeflow/navierstokes/test_channel.cc

test/freeflow/navierstokes/test_closedsystem.cc

test/freeflow/navierstokes/test_donea.cc

test/freeflow/navierstokes/test_kovasznay.cc

test/freeflow/navierstokesnc/channeltestproblem.hh

test/freeflow/navierstokesnc/densityflowproblem.hh

test/freeflow/navierstokesnc/msfreeflowtestproblem.hh

test/freeflow/navierstokesnc/test_channel.cc

test/freeflow/navierstokesnc/test_densitydrivenflow.cc

test/freeflow/navierstokesnc/test_msfreeflow.cc

test/porousmediumflow/1p/implicit/1pniconductionproblem.hh

test/porousmediumflow/1p/implicit/1pniconvectionproblem.hh

test/porousmediumflow/1p/implicit/1ptestproblem.hh

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