- Feature #1: Deployment by Gitlab CI/CD, to avoid the hassle of generating all images on my laptop. - Boost: remove system and filesystem modules. - Update Boost to v1.72. - Ubuntu Dockerfile now uses up gcc 9, as gcc 8 does not yet implement STL filesystem. - Update QuantStack stack to more recent versions: Xsimd 7.4.6, Xtensor 0.21.3, Xtensor-blas 0.17.1 and Xtl 0.6.12. - Update Tclap to v1.2.2. - Update Openblas to 0.3.7. - Update PETSc to 3.12.4 - Various fixes in Dockerfiles and Yaml.