Merge branch 'mr_fix_pdffield_initializer' into 'master'

PdfField Initializer Fix

Closes #185

See merge request walberla/walberla!540
40 jobs for master in 181 minutes and 7 seconds (queued for 2 seconds)
Name Stage Failure
failed
clang_13.0_mpionly_dbg Test
You should consider upgrading via the '/usr/bin/python3 -m pip install --upgrade pip' command.
$ python3 cmake/ctest2junit.py build > report.xml
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Uploading artifacts...
report.xml: found 1 matching files and directories

python/report.xml: found 1 matching files and directories

Uploading artifacts as "junit" to coordinator... 201 Created
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Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1

failed
msvc-14.2_mpionly_dbg Test
  PE_UNION.vcxproj -> C:\cygwin64\home\build\builds\holzer\walberla\build\tests\pe\DebugOptimized\PE_UNION.exe
Running after_script
Running after script...
$ pip3 install lxml
bash: line 127: pip3: command not found
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Cleaning up project directory and file based variables
ERROR: Job failed: Process exited with status 1