* generic/tclCmdAH.c (Tcl_CatchObjCmd, Tcl_ErrorObjCmd):

        Updated to call the new TclGet/SetReturnOptions routines to do
        much of their work.

        * generic/tclInt.h (TclGetReturnOptions,TclSetReturnOptions):
        * generic/tclResult.c (TclGetReturnOptions,TclSetReturnOptions):
        New utility routines to get/set the return options of an interp.
        Intent is that these routines will be converted to public routines
        after TIP approval.

        * generic/tclCmdMZ.c (TclProcessReturn,TclMergeReturnOptions):
        * generic/tclResult.c (TclProcessReturn,TclMergeReturnOptions):
        Move internal utility routines from tclCmdMZ.c to tclResult.c.

        * generic/tclBasic.c (Tcl_CreateInterp, Tcl_DeleteInterp):
        * generic/tclResult.c (TclTransferResult):      Rework so that
        iPtr->returnOpts can be NULL when there are no special options.

        * generic/tclResult.c (TclRestoreInterpState):  Plug potential
        memory leak.

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