Remove caching of GlobalMatrix and GlobalVector objects.

See merge request !3659

[Web] Web documentation of the parallel-plate testcase.

See merge request !3658

The caching mechanism was removed in previous commits.

TH2M refactorings

See merge request !3656

A set of independent small changes.

See merge request !3657

Dmitri Naumov authored 3 years ago and Tom Fischer committed 3 years ago

spdlog is linked "public" in BaseLib.

Reason is the violation of odr for some globals defined
in the spdlog library.

==1540297==ERROR: AddressSanitizer: odr-violation (0x7f5ea9c9d020):
  [1] size=40 'vtable for spdlog::spdlog_ex' _deps/spdlog-src/src/spdlog.cpp
  [2] size=40 'vtable for spdlog::spdlog_ex' _deps/spdlog-src/src/spdlog.cpp
These globals were registered at these points:
  [1]:
    #0 0x5614686e0dfa in __asan_register_globals.part.0 (/home/naumov/w/ogs/d/bin/ogs+0x1bfdfa)
    #1 0x7f5e6cdbe7eb in asan.module_ctor (/home/naumov/w/ogs/d/bin/../lib/libMeshLib.so+0x17d37eb)

  [2]:
    #0 0x558bd62b6dfa in __asan_register_globals.part.0 (/home/naumov/w/ogs/d/bin/ogs+0x1bfdfa)
    #1 0x7f831c7e54ab in asan.module_ctor (/home/naumov/w/ogs/d/bin/../lib/libBaseLib.so+0x89a4ab)

Needed for correct computation of thermal strains
and solid material models' updates.

Stresses and strains are now updated together with all the other
constitutive variables.

Function is not needed.

Rewrite update of deactivated subdomains.

See merge request !3654

Data member is used only in constructor, no need to store it.

Some parts of the code expect an empty set of active elements
if all of the elements are active.

Two parallel excavations starting at different times
and with different excavation rates. Mainly for testing
of the multi material excavation procedures.

The previous implementation was looking for one deactivated
subdomain, but there could be multiple subdomains inactive
at the same time. Now all deactivated subdomains are
searched for active/inactive elements.

New Process: Stokes flow

See merge request !3617