reactingParcelFoam, coalChemistryFoam: Added LTS support

Replaces LTSReactingParcelFoam and LTSCoalChemistryFoam

    Select LTS via the ddtScheme:

        ddtSchemes
        {
            default         localEuler rDeltaT;
        }

tutorials/multiphase/interFoam/ras/waterChannel/README

@@ -1,6 +0,0 @@
-- This case uses blockMesh and extrudeMesh to create a channel geometry.
-  - See Allmesh script to generate geometry.
-- The case is set up to run with interFoam.
-- For running with LTSInterFoam, an alternative set of main files from
-  system directory (controlDict, etc) are included in LTSInterFoam
-  subdirectory to replace the existing files set up for interFoam.