Add MT switch for Visual Studio; do not let windows.h to defined min/max macros from mpi.h; fix uninitialized values from MPI

Prevent crash for meshes without ACTNUM

To prevent output warning

For newer PetscOptionsGetString

Update geometric algorithms, improve SplitNonplanar tool, introduce
CollapseDegenerate tool (currently only deletes cells).

Fix algorithm that redistributes parts of the graph when certain
processors do not have any cells. Required for parmetis to work.

Replace algorithms for computation of barycenter, volume, area, normal.
Unit test for algorithms. Separate algorithm for computation of
orientation of faces.

Swap algorithm for variables for a faster matrix inversion algorithm.
Minor optimization for Matrix::Solve, more general templates for
multiplication.

Add a grid tool to split non-planar faces.

Matrix of integers in inmost_dense.h.

Fix some warnings in grdecl reader in mesh_ecl_file.cpp.

Fix for mean value calculation over faces in geometry.cpp.

Added base64 encoding/decoding for future binary vtu reader.

Some improvements for input handling on mac in OldDrawGrid example.

+unit tests

GRDECL reader - check time steps are not negative, write well direction.

MPTILUC - prevent out of memory access for singular matrices.

Add well depth and information on time steps.

Various helpful tools for grids.

Added linked_array structure that represents linked list with subarray of constant size. This elemenates possible crash with openmp when mesh is simultaneously modified and data is accessed. Previously when array of links was reallocated in chunk_array due to mesh growth, the pointer may be simultaneously changed due to reallocation and be accessed by another thread. Now reallocation adds another segment of the array in linked list making previous records intact. To restore previous behavior undefine NEW_CHUNKS in container.hpp.

Replaced algorithm in GRDECL reader that determines location of intersection of segments from projected to physical coordinates. Privously it was performed with bilinear interpolation of pillar coordinates. This leads to segments being curvilinear arcs in physical world. Now the location is determined at the middle of the shortest possible segment between two original segments. ECL_CURVILINEAR option is absolute.

GRDECL reader now parses wells, well complitions, well specifications, well groups and defines well schedule through tags.

ComputeGeometricType returns MultiLine type when lower level adjacent elements are of mixed type.

Separating routines and classes in Examples/OldDrawGrid into files for future reuse. Making streamline calculator universal with respect to definition of data on various element types and adding option to visualize data as streamlines.

Many updates to GRDECL file format:
- Processing more properties fields, such as pressure, sgas, soil, etc.
- Processing MULTIPLY keyword for properties and transmissibilities
- Introduced field TRANM for transmissibility multipliers set with TRANX/TRANY/TRANZ keywords in MULTIPLY keyword, or with EDITNNC keywords or FAULTS/MULTFLT keyword
- Algorithm that separates faces in place of blocks with zero volume and nonzero ACTNUM. Option ECL_DEGENERATE that replaces algorithm with transmissibility multiplier in TRANM.
-Optimization: bypass algorithm that resolves faces out of set of edges when only one face is expected.
- Processing of NTG keyword.

Fix swap algorithm in dynarray container.

Loading of 2d and mixed 2d/3d grids from VTU files.

Fix Visual Studio warnings in sparse.cpp

Improvemens in Connect/Disconnect, determination of element type when it connects to lower dimensional elements of mixed dimensionality.

Add const to argument to UniteCells, UniteFaces, UniteEdges

Fix const-correctness in class matrix

Display references as segments and variable as field in OldDrawGrid example. Separate OldDrawGrid source into files.

Remove warnings in visual studio in modify.cpp and SolverInner.cpp

Improve output in OldDrawGrid example.

Fix compilation problem reported by Vasily Kramarenko.