Motion by defendants to dismiss appeal for failure to comply with the Rules of Appellate Procedure denied 26 July 1990. Petition by plaintiff for discretionary review pursuant to G.S. 7A-31 allowed 26 July 1990. Petition by defendants for discretionary review pursuant to G.S. 7A-31 allowed 26 July 1990. Petition by defendants for writ of supersedeas allowed 26 July 1990.