Enabled PETSc 3.5
Changed if-condition for PETSc version according to the suggestion by Nori
[bugfix] fixed issue where raster to mesh conversion would fail if all all intensity values were negative
Merge branch 'master' of https://github.com/ufz/ogs
Replace BaseLib::number2str with std::to_string.

Also remove the header StringTools.h everywhere.
Add a previously missing sstream include in DateTools.cpp.
[GeoLib] Another version for GEOObjects::getGeoObjects().

The commit is a preparation to access GeoObject objects via the geometry
name and the object name (patch name).
Merge pull request #448 from TomFischer/GeoLibGetGeoObjectsByName

[GeoLib] Another version for GEOObjects::getGeoObjects().
Merge pull request #456 from endJunction/StdToString

Replace BaseLib::number2str with std::to_string.
Added one more condition for PETSc versions
Merge pull request #450 from wenqing/forPETSc35

Enabled PETSc 3.5
extended implementation of gsp file to specify processes and store process-dependent data
removed debug msg
fixed indentation and renamed method
renamed gsp-interface to project-interface
[AL] Forward additional args for local assembly.
[AL] Overloaded SerialExecutor::execute().

The overloaded version takes a third argument. This argument is used
needed properties in the local assembler.
[AL] Overloaded VectorMatrixAssembler::operator().

The overloaded version has a parameter for data needed by the local assembly process.
[AL] Add SimpleAssembler used for shape matrix initialization.

No local vectors/matrices and no modification of global vector/matrix.
[MGTL] Fix calculation of search length.

In case of aquidistant meshes the expression sum_of_sqr - (sum*sum)/edge_cnt can
get negative due to numerical calculation.  The root of a negative value is not
computable in real numbers.
[MGTL] Added class MeshNodesToPoints.

It is used for conversion of mesh nodes to geometric points required for
visualization.