- support LIS_ROOT_DIR
- add some hints to find it

- split setZero() to constructor and remove _is_initialized
- remove MPI part
- check LIS return code for each calling
- use stringstream instead of sprintf
- use INFO() instead of cout and printf for consistency

initialize and finalize Lis library before starting testing

- test if given option is correctly parsed
- move initialization of Lis to testrunner.cpp

updating LisOption
- documentation
- add more solver and preconditioner type
- add matrix_type

update LisLinearSysetem
- impose prescribed values by penalty coefficient
- support matrix_type, solver_precon_arg in LisOption

use boost::property_tree in ISystemOfLinearEquation to pass configuration to solvers

change GET_SOURCE_FILES() in Functions.cmake to  include *.tpp and store relative file path instead of absolute one

Using relative path makes easier to modify a list of source files later, e.g. removing particular source files depending on configuration.

moved vtk-independent functionality from VtkRaster to Raster and modified existing functionality in Raster so that everything fits.

E.g. nullptr is introduced in 4.6.

Boost integration

refactored image reading routines such that alpha-channels are ommitted from double arrays and only inserted right before conversion to vtkImageData object (where this information is needed)

Note that the flags are only appended, not substituted.

Fix errors with intel compiler