ENH: add ZoneMesh::findIndices() method

...utilities/surface/surfaceMeshConvert/surfaceMeshConvert.C

...s/utilities/surface/surfaceMeshExport/surfaceMeshExport.C

...s/utilities/surface/surfaceMeshImport/surfaceMeshImport.C

src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.C

src/OpenFOAM/meshes/polyMesh/zones/ZoneMesh/ZoneMesh.H

src/finiteVolume/cfdTools/general/porousMedia/porousZone.C

src/meshTools/coordinateSystems/coordinateSystem.C

src/meshTools/coordinateSystems/coordinateSystems.C

src/meshTools/coordinateSystems/coordinateSystems.H