RunFunctions: Added "isTest()" argument parsing function
tutorials: Updated Allrun scripts to propagate the "-test" option
tutorials: Removed the lower Alltest scripts and updated the Allrun to
use the "isTest()" function to handle test-specific operation
foamRunTutorials now accepts two arguments:
-test : Preferentially execute Alltest, if present, over Allrun.
-skipFirst : Skip Alltest/Allrun at the top level to prevent recursion
Added because some tutorials are not dependent on controlDict and take
a long time.
