Merge pull request #11066 from bangerth/fesys

Use operator^ to create FESystem objects in the tutorials.

diff --cc examples/step-32/step-32.cc
Simple merge

diff --cc examples/step-33/step-33.cc
Simple merge

diff --cc examples/step-44/step-44.cc
Simple merge

diff --cc examples/step-45/step-45.cc
Simple merge

diff --cc examples/step-62/step-62.cc
Simple merge

diff --cc examples/step-68/step-68.cc
Simple merge

diff --cc examples/step-70/step-70.cc
Simple merge