build an outline from the current layout cell
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OUTLINE build a black box from a layout.
After a call to OUTLINE, the figure has only its abutment box,
its connectors, references and feed through.
/* Create a figure to work on */
/* Place an instance */
GENLIB_PLACE_TOP("model2", "i3", NOSYM);
/* define the new abutment box as the standard envelop */
GENLIB_DEF_AB(0, 0, 0, 0);
/* Save all that on disk */