ENH: additional step function, cleanup autoPtr use in Function1

src/OpenFOAM/Make/files

...FOAM/primitives/functions/Function1/Function1/Function1.C

...FOAM/primitives/functions/Function1/Function1/Function1.H

...OpenFOAM/primitives/functions/Function1/One/OneConstant.C

...OpenFOAM/primitives/functions/Function1/One/OneConstant.H

...ves/functions/Function1/PolynomialEntry/PolynomialEntry.C

...ves/functions/Function1/PolynomialEntry/PolynomialEntry.H

src/OpenFOAM/primitives/functions/Function1/Scale/Scale.C

src/OpenFOAM/primitives/functions/Function1/Scale/Scale.H

src/OpenFOAM/primitives/functions/Function1/Sine/Sine.C

src/OpenFOAM/primitives/functions/Function1/Sine/Sine.H

src/OpenFOAM/primitives/functions/Function1/Square/Square.C

src/OpenFOAM/primitives/functions/Function1/Square/Square.H

src/OpenFOAM/primitives/functions/Function1/Table/Table.C

...OpenFOAM/primitives/functions/Function1/Table/TableBase.C

...OpenFOAM/primitives/functions/Function1/Table/TableBase.H

...FOAM/primitives/functions/Function1/TableFile/TableFile.C

...FOAM/primitives/functions/Function1/TableFile/TableFile.H

...enFOAM/primitives/functions/Function1/Zero/ZeroConstant.C

...enFOAM/primitives/functions/Function1/Zero/ZeroConstant.H