Merge branch 'RunFunctions' into 'merge-foundation'

ENH: added -decomposeParDict as argument to getNumberOfProcessors()

Continuing discussion at 
5c24ee40 (comment 1093)

Now the Allrun script could be
```
runParallel -decomposeParDict system/decomposeParDict-6 snappyHexMesh -overwrite
```

Thanks @Mattijs 


See merge request !36