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.

Quick and dirty reader for XML VTK files of unstructured grids.

Creating elements cause reallocation of internal array, pointing to blocks of data. Other processor may use deallocated pointer to the array stored in cache.

GetAttrib and GetChild by name

Correctly handle trailing comments after keywords.

Prevent visual studio to complain under debug that array subscript is out of range.

+switch off Octree example - not compiling on windows

+prevent heap overflow due to big arrays in OldDrawGrid

Automatically switch off packages in cmake when related libraries are not found

operator () that return data in matrix form for TagRealArray and
TagVariableArray

Fix dot product of dense matrices, introduce submatrix operator for
dense matrices that allows to manipulate data in part of the matrix.

Do not store automatizator reference in dynamic_variable.

When only PERMX is provided in GRDECL file, consider it as scalar
permeability.

Simple test for int32 overflow testing in nnz count for fcbiilu2

Conflicts:
	Examples/Octree/main_test.cpp

Do not build Octree when opengl was not found.

Constant correctness for dense matrices.

Refinement into cube and sphere in AdaptiveMesh for specific tests with
MFD-ES