Fix PETSc segfault issues #469
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There, calling transfer_matrix.createVecs() was causing segfaults. However, the matrix could still be used for multiplication, which works just fine The call to createVecs was unnecessary, and thus removed.
Replace calls to `getVec...` with `createVec` for better petsc4py / PETSc match Refactor the way the transfer matrix is used for the global deformation (createVec does not have to be called here)
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This PR merges the changes from patch 2.1.4 into main.
This will hopefully be sufficient for #325 and #320