* generic/tclBasic.c (Tcl_AddObjErrorInfo): More re-organization

        * generic/tclCmdAH.c (Tcl_ErrorObjCmd):     of the management of
        * generic/tclCmdMZ.c (TclProcessReturn):    the errorCode value.
        * tests/error.test (error-6.4-9):

        * generic/tclNamespace.c (TclTeardownNamespace): Tcl_Obj-ified
        * tests/namespace.test (namespace-8.5,6):       the save/restore
        of ::errorInfo and ::errorCode during global namespace teardown.
        Revised the comment to clarify why this is done, and added tests
        that will fail if this is not done.

        * generic/tclResult.c (TclTransferResult):      Added safety
        checks so that unexpected undefined ::errorInfo or ::errorCode
        will not lead to a segfault.

        * generic/tclTrace.c (TclCallVarTraces):     Save/restore the flag
        * tests/var.test (var-16.1):    values that define part of the
        interpreter state during variable traces.  [Bug 10381021].

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