Adding tutorials and other minor changes

Merge branch 'develop-pre-release' of develop.openfoam.com:Development/OpenFOAM-plus into develop-pre-release

- incorrect coordinateSystem clear() after the move

- add Test-coordinateSystem

Merge branch 'develop-pre-release' of develop.openfoam.com:Development/OpenFOAM-plus into develop-pre-release

Correcting tutorial and expanding documentation

- this provides easily sortable names.

  The time information is available via the corresponding .series
  file, which can also be loaded directly with ParaView 5.5 or later.

  For further redundancy, time information is saved in the first XML
  comment inside of the .vtp files. For example,

      <!-- cloud=limestoneCloud1 time=0.005 index=200 -->

- The additional output generated by #calc directives in the
  controlDict or decomposeParDict causes issues for the RunFunctions
  extraction of 'application' and 'numberOfSubdomains'.

  Avoid by using -disableFunctionEntries, which also has the side-effect
  of disabling '#include'.

- major() and minor() are GNU macros in sys/sysmacros.h
  and generates warning on some systems (eg, Ubuntu 18.04)

  use getMajor() and getMinor() as method names instead.

- corrected the mass based correction and updated the misleading function
  arguments

- moved the option to the optimisation switches, e.g.:

    OptimisationSwitches
    {
        experimentalDdtCorr 1;
    }

- default remains off/no (0)

- add support by using updated foamEtcFile from 1806, which also add
  the '-config' short-cut option.

- also fix incorrect documentation in forces functionObject and
  interRegionExplicitPorositySource fvOption.

- use floor/truncate instead of round. Backport of changes in the
  develop-pre-release branch.

- bump to ParaView 5.5.1