Made all algorithms for matrices abstract from matrix implementation.

Added few algorithms:
Solve - find A*X=B with A and B matrices
PseudoSolve - find X=A^+*B using singular value decomposition.
Kronecker product
operator / for B^{-1}*A
operator *= for in-place multiplication

Added ability to specify storage type for Matrix, allows for
Matrix<Storage::real,Storage::real_array> or
Matrix<Storage::var,Storage::var_array> to directly manipulate data
stored in the mesh.

Class SubMatrix with full matrix functionality to address and
manipulate some submatrix in original matrix.

Fully commented in doxygen inmost_dense.h.

Silence solver initializer when database file provided as “”.

Small fix for previous merge 

some improvements in *BIILU2 interfaces

Silence solvers complaints about parameters.

Updates for Tests/solver_test001

Disable TagVariable and TagVariableArray when USE_AUTODIFF is disabled.

Fixes for Octree example.

Added some doxygen comments into inmost_dense.h

Added comments to Element::Boundary

Handy replacement for Tag class that provide data access through square
brackets.

Several fixes to solvers

# SolverPETSc cmake file case sensitive
# SuperLU segmentation fault fixed
# Trilinos enumeration namespace fixed
# Examples mpi off fixed

Solver class refactoring

If second line in vtk file equals  "VTK_OUTPUT_FACES file is written by
INMOST"
indicates that there are property values stored also on faces

# Conflicts:
#	Source/Solver/solver.cpp
#	Source/Solver/solver_bcgsl.hpp

Fix input/output of empty dense data with xml file format.

Fix parsing empty parentheses as vector with zero entries in xml files.

Fix modification algorithm.

Fix vector graphics output in OldDrawGrid

Add exposition of mesh by material in OldDrawGrid

Few switches in solver to handle large mechanics matrices

1)SetParameter for fcbiilu2
2) deleted void*

# Conflicts:
#	Examples/ADMFD/main.cpp
#	Examples/GridGen/main.cpp
#	Tests/solver_test000/CMakeLists.txt
#	Tests/solver_test002/CMakeLists.txt