Small clean ups in CI file. Use docker image with specific ubuntu version.

See merge request irmb/VirtualFluids_dev!58

Develop

See merge request irmb/VirtualFluids_dev!57

# Conflicts:
#	src/gpu/VirtualFluids_GPU/GPU/CalcMac27.cu

(cherry picked from commit 77aca325)

before only one channel side could have a velocity boundary condition (bc). When setting a bc at a second side, the first bc was overwritten.
Velocity bcs were fied in the previous commit (bda2c544271657adfabb63e9ae974e77692566a6). This commit fixes the boundaryQs for velocity.

(cherry picked from commit 811e344b)

before only one channel side could have a velocity boundary condition (bc). When setting a bc at a second side, the first bc was overwritten.

(cherry picked from commit daa787a3)

Fix memory issue.

See merge request irmb/VirtualFluids_dev!55

Add DataCite compliant metada.xml. Adjust AUTHORS.md

See merge request irmb/VirtualFluids_dev!50

Add new library, which contains the calculation of the macroscopic quantities and a general cumulant computation. (Closes #13)

Closes #13

See merge request irmb/VirtualFluids_dev!34

Merge branch 'feature/united_code' of https://git.rz.tu-bs.de/soe.peters/VirtualFluids_dev into feature/united_code