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Adapt library and examples for 64-bit integer option (USE_INT64=ON); adapt library (but not yet examples) for 32-bit float option (USE_FP64=OFF); make gcc happy on library compilation  with -Wall -Wextra -pedantic; replace malloc/realloc/free with new/delete in container.hpp

introduced in previous commit

Add Examples/ADVDIFF example for advection-diffusion

Add exotic grid generators to Examples/GridTools

Add Examples/TestSuits for tests of diffusion and advection-diffusion
problems

Remove dependence on mesh in Automatizator

Fix few warnings on llvm-g++ in container.hpp

Add converter from elasticity tensor into matrix

Added separate hessian_variable that enables hessian calculation

1) Parameters parsing in inner solvers
2) Parameters parsing in trillions solvers
3) Added xml parsing test
4) Trilinos without mpi support will not compile, disable trillions
solvers if compiling without mpi

Basic functionality

Incorrect order of parameters to UnpackTagData called from
UnpackElementsData.

Fix a bug that lead to exception when packing variable-sized data with
zero size.

Do not shift cell centers for eclipse grids when edges are curvilinear.
(another algorithm is needed to fix cell centers that are outside of
cells)

1) Condest added to final solver interface
2) SolverMaster hided from user
3) Examples fixed with new Solver Class
4) Examples using LLVM coding standarts

Cleanup of Row class and Matrix class.

Significantly reduced memory required for Row class and consequently for
multivar_expression class. Moved out openmp locks and row annotation as
additional service classes.

Introduced classes HessianRow and HessianMatrix for future possibility
of hessian computation in automatic differentiation.

Some features for class Residual.

Clean-ups in xml.

Updated MFD.

Adapted ADFVdiscr for Residual class.

Matrix<Var>::DotProduct will promote type depending on the argument.

Including issue #15