Bugfix: Add overload for linear_operator that takes a LinearOperator exemplar
Bugfix: Add overload for linear_operator that takes a LinearOperator exemplar

This allows to copy the reinit functions from a LinearOperator directly.

sairajat/dealii,danshapero/dealii,danshapero/dealii,danshapero/dealii,kalj/dealii,sairajat/dealii,sairajat/dealii,danshapero/dealii,naliboff/dealii,kalj/dealii,kalj/dealii,naliboff/dealii,danshapero/dealii,kalj/dealii,sairajat/dealii,naliboff/dealii,danshapero/dealii,kalj/dealii,naliboff/dealii,kalj/dealii,sairajat/dealii,naliboff/dealii,danshapero/dealii,naliboff/dealii,sairajat/dealii,sairajat/dealii,kalj/dealii,naliboff/dealii