Merge branch 'feature/local_operator' into 'develop'

examples/ellipt.cc

src/amdis/Assembler.hpp

src/amdis/Assembler.inc.hpp

src/amdis/ContextGeometry.hpp

src/amdis/FiniteElementSpaces.hpp

src/amdis/GridFunctionOperator.hpp

src/amdis/LocalAssembler.hpp

src/amdis/LocalAssemblerBase.hpp

src/amdis/LocalAssemblerList.hpp

src/amdis/LocalOperator.hpp

src/amdis/ProblemStat.hpp

src/amdis/ProblemStat.inc.hpp

src/amdis/QuadratureFactory.hpp

src/amdis/assembler/ConvectionDiffusionOperator.hpp

src/amdis/assembler/FirstOrderDivTestvecTrial.hpp

src/amdis/assembler/FirstOrderGradTestTrial.hpp

src/amdis/assembler/FirstOrderGradTestTrialvec.hpp

src/amdis/assembler/FirstOrderPartialTestTrial.hpp

src/amdis/assembler/FirstOrderTestDivTrialvec.hpp

src/amdis/assembler/FirstOrderTestGradTrial.hpp