Update OpenFOAM-OpenFOAM tutorials according to major preCICE config changes

[MakisH]

This PR applies the same changes as precice/tutorials#60, namely:

• Remove the precice-config_parallel.xml files. We don't need mpi-single to run parallel cases anymore. Furthermore, distribution-type is removed from preCICE (breaking change).
• Rename precice-config_serial.xml to precice-config.xml, replacing the respective link.
• Remove the link creation mechanism in runFluid, runSolid, Allrun, Allrun_parallel.

Depends on precice/precice#572.

[MakisH]

This corrensponds to a diferent change in preCICE, but since in the tutorials repository they are treated as one, it's ok to treat it as one here as well.

[MakisH]

However, we need to update this for every tutorial.

[BenjaminRodenberg]

precice/tutorials#60 already contains this change. E.g. here. Sorry, if I am causing confusion. I thought that #107 is just the OpenFOAM version of precice/tutorials#60. (And it is more convenient for our current testing problems, if the breaking changes are not scattered)

[MakisH]

Yes, but we have more tutorials here (i.e. the nearest-projection variant). Just let me take care of this.

[BenjaminRodenberg]

And it is more convenient for our current testing problems, if the breaking changes are not scattered

I think I can hack around this problem in my testing branch (see precice/systemtests@2460f9a). Therefore, you can ignore this argument. If you want to keep things separated, feel free to git revert 1e826a8

[MakisH]

This is ready to merge, but the system tests fail with unclear reason.

[Eder-K]

The error in this tests seems to be the same one that is currently being worked on in precice/systemtests#150. When triggering a test here, we should therefore have it run on the branch of the PR.

However, the triggering script used here

openfoam-adapter/.travis.yml

Line 11 in eb94d5a

- curl -LO --retry 3 https://raw.githubusercontent.com/precice/systemtests/master/trigger_systemtests.py

is taken from the master branch of systemtests. That script version in turn is quite old and only runs tests on systemtests/master, which doesn't contain the aforementioned fixes from precice/systemtests#150. The functionality for triggering on different branches is currently in precice/systemtests#143.

So, to run the test, we could alter the .travis.yml file here to first pull the new script version from PR 143 and then run on PR 150:

      script: 
        - curl -LO --retry 3 https://raw.githubusercontent.com/precice/systemtests/i_141/trigger_systemtests.py
        - travis_wait 60 python trigger_systemtests.py --adapter openfoam --wait --branch BenjaminRueth-patch-of-of