Follow-up of !3676 "Dropped the rotation of the shape function gradients".

Putting IntegrationMethod after GlobalDim enables automatic
template argument deduction for that type.

This saves passing dt to all the computeSecondaryVariable
functions. Having the dt finally removes the dt member
from the ProcessData.
Calling postTimestep is equivalent to the call of compute
secondary; see TimeLoop.cpp; those are called one after
each other.

Fixes multiple copyright messages in the doxygen docu.

ag '\\file' -L --ignore=ThirdParty *Lib |xargs  sed -i 's/\(.*\)\\copyright/\1\\file\n\1\\copyright/'

Adding permeability model to the derived class.

clang-tidy '*readability-braces-around-statements'

The usage in the code is simpler due to value semantics.
Initialization is more safe.

With this the aperture0 can be defined on mesh nodes
and will be interpolated onto the integration points.

Clang format run on near-the-header lines.

Happy New Year

for consistency.

As in all other processes.

This is used to prevent negative apertures.

New mesh properties for fracture relative displacement and shear stress in the additional coordinate for output.

Otherwise in the first output of secondary variables
these are uninitialized.

... instead of setZero() call.
This is idiomatic and saves few cycles.