glang: Update core PieExpr.write() to match non-core PieExpr.write()
glang: Update core PieExpr.write() to match non-core PieExpr.write()

foam-framework/foam,osric-the-knight/foam,osric-the-knight/foam,mdittmer/foam,jlhughes/foam,mdittmer/foam,osric-the-knight/foam,jlhughes/foam,foam-framework/foam,jlhughes/foam,foam-framework/foam,mdittmer/foam,jacksonic/foam,jlhughes/foam,jacksonic/foam,mdittmer/foam,foam-framework/foam,jacksonic/foam,jacksonic/foam,osric-the-knight/foam,foam-framework/foam