Merge branch 'feature/improve-initial-phasepresence' into 'master'

CHANGELOG.md

dumux/implicit/problem.hh

dumux/porousmediumflow/2p1c/implicit/model.hh

dumux/porousmediumflow/2p2c/implicit/model.hh

dumux/porousmediumflow/3p3c/implicit/model.hh

dumux/porousmediumflow/3pwateroil/model.hh

dumux/porousmediumflow/implicit/problem.hh

...trixinteractions/2p/thermalconductivityjohansenproblem.hh

...trixinteractions/2p/thermalconductivitysomertonproblem.hh

...matrixinteractions/effectivediffusivityconstantproblem.hh

...rixinteractions/effectivediffusivityconstanttauproblem.hh

...nteractions/effectivediffusivitymillingtonquirkproblem.hh

test/multidomain/2cnistokes2p2cni/2p2cnisubproblem.hh

test/multidomain/2cnizeroeq2p2cni/2p2cnisubproblem.hh

test/multidomain/2cstokes2p2c/2p2csubproblem.hh

test/multidomain/2czeroeq2p2c/2p2csubproblem.hh

test/porousmediumflow/2p1c/implicit/steaminjectionproblem.hh

test/porousmediumflow/2p2c/implicit/injectionproblem.hh

test/porousmediumflow/2p2c/implicit/waterairproblem.hh

test/porousmediumflow/3p3c/implicit/columnxylolproblem.hh