Doxygen comments for Automatizator class.

Some additional features for Automatizator class: copy/assignment, list
tags, unregister tag.

Fix compilation issue with Octree example on newer gcc.

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

Added Reverse-Cuthill-McKee reordering into INNER_MPTILUC preconditioner
as default reordering when Metis_NodeND is not provided. On the tests
RCM shows 10% more fill-in in inverse factors then with Metis_NodeND,
but the RCM reordering procedure is 4 times faster then Metis_NodeND and
overall computational time decreases with RCM.

Fix type mismatch warnings in autodiff.cpp

RowMerger can now remap global indices that do not belong to initial
interval span into local indices and back. This leads to important
memory optimization in Automatizator, which now do not require
RowMerger interval to span over entire range of global indices on each
processor, but require only a small extension.

Added calculation of nonlocal indices of ghost elements in
Automatizator::EnumerateDynamicTags

Fixed a warning in mesh_ecl_file.cpp

Fixed SVG output in OldDrawGrid example that was not sorting correctly
the faces, leaded to visual artifacts.

OldDrawGrid example: mesh slicing algorithm can now correctly resolve
multiple slices on single cell.

USE_AUTODIFF do not require USE_SOLVER and USE_MESH:
If USE_MESH is not activated, class Automatizator and algebra for
abstract variables is not compiled.
If USE_SOLVER is not activated, class Residual is not compiled.

Fixed reverse_iterator::operator- in ElementArray.

class incident_matrix that computes closed loops out of set of edges or
faces can now work on coordinates other then physical coordinates.

Fixed Face::SplitFace() was not connecting newly created faces to cells.

Cell::Volume() now uses algorithm working correctly on non-convex cells.

Face::CheckNormalOrientation() will now use volume calculation
algorithm for non-convex cells to correctly orient faces.

Face::FixNormalOrientation() will now use Face::SwapCells() instead of
Face::ReorderEdges() on internal faces. New version is thread-safe with
respect to Face::CheckNormalOrientation().

Improved algorithm for loading eclipse meshes.

Renamed GetDerivative to GetJacobian

Changed how matrix annotation is handled to decrease memory required to
store data of type DATA_VARIABLE.

Added multivar_expression_reference that can reference individual matrix
row.

Added Residual class.

Fixed that Sparse::Matrix::Load and Sparse::Vector::Load may required
MPI initialization.

Including issue #15

Fixes for GCC.

Moved functionality to operate with dense matrices as INMOST service.

Added possibility to exchange data of type DATA_VARIABLE in parallel.

Added possibility to include external content in xml format.

Moved overloaded operators for variables from namespace INMOST into
global scope to prevent possible ambiguities in compilers.

Added perturbation algorithm for BCGS solver.