fixed memory leak problem in PetscSolverGlobalMatrix::solvePetscMatrix() if…

Reuther, Sebastianrequested to merge
dev into master

fixes #4 (closed), i.e. memory leak problem in PetscSolverGlobalMatrix::solvePetscMatrix() if initfile option to remove contant nullspace is used

Edited by Praetorius, Simon

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