GitLab

Added 2-clause bsd license for cmake files requested in cmake script for
petsc.
Introduced cmake option for Mondriaan matrix partitioning package for
solvers.
Changed reading of solver's parameters database to fix uninitialized
access reported by dr.memory.
Fixed bug in svdnxn with static std::vector allocation.
Added features to OldDrawGrid example.
Added solutions to problems described in issue #13.

Replaced russian comments in doxygen.
Examples with OpenGL would not lead to error in cmake if no library is
found.