Rename get-methods

examples/convection_diffusion.cc

examples/ellipt.cc

examples/heat.cc

examples/navier_stokes.cc

examples/stokes0.cc

examples/stokes1.cc

examples/stokes3.cc

examples/vecellipt.cc

src/amdis/AdaptBase.hpp

src/amdis/AdaptInfo.cpp

src/amdis/AdaptInfo.hpp

src/amdis/AdaptInstationary.cpp

src/amdis/AdaptInstationary.hpp

src/amdis/AdaptStationary.cpp

src/amdis/Assembler.hpp

src/amdis/FileWriter.hpp

src/amdis/Flag.hpp

src/amdis/GridFunctions.hpp

src/amdis/LocalAssembler.hpp

src/amdis/LocalAssemblerList.hpp