STYLE: argList::opt method instead of the longer argList::lookupOrDefault

applications/solvers/basic/potentialFoam/createFields.H

...vers/basic/potentialFoam/overPotentialFoam/createFields.H

applications/solvers/lagrangian/DPMFoam/createFields.H

...lagrangian/icoUncoupledKinematicParcelFoam/createFields.H

...rs/lagrangian/uncoupledKinematicParcelFoam/createFields.H

applications/test/checkDecomposePar/Test-checkDecomposePar.C

applications/test/decomposePar/Test-decomposePar.C

...tions/test/externalFileCoupler/Test-externalFileCoupler.C

applications/test/momentOfInertia/Test-momentOfInertia.C

applications/test/spline/Test-spline.C

...tions/test/surfaceIntersection/Test-surfaceIntersection.C

...cations/test/surfaceMeshConvert/Test-surfaceMeshConvert.C

applications/test/tokenize/Test-tokenize.C

applications/test/vtkSeriesWriter/Test-vtkSeriesWriter.C

...ons/utilities/mesh/advanced/collapseEdges/collapseEdges.C

...ities/mesh/advanced/combinePatchFaces/combinePatchFaces.C

applications/utilities/mesh/advanced/splitCells/splitCells.C

...tions/utilities/mesh/conversion/ansysToFoam/ansysToFoam.L

...tions/utilities/mesh/conversion/ccm/ccmToFoam/ccmToFoam.C

...cations/utilities/mesh/conversion/cfx4ToFoam/cfx4ToFoam.C