Fix build on Euler
The build of the master branch currently fails on Euler.
/cluster/home/webmanue/aqcnes/src/solver/petscSolver.ipp:415:3: error: ‘ofstream’ was not declared in this scopeTo receive notifications about scheduled maintenance, please subscribe to the mailing-list gitlab-operations@sympa.ethz.ch. You can subscribe to the mailing-list at https://sympa.ethz.ch
The build of the master branch currently fails on Euler.
/cluster/home/webmanue/aqcnes/src/solver/petscSolver.ipp:415:3: error: ‘ofstream’ was not declared in this scope