Still waiting to consummate nuptials with Borland International Inc, Ashton-Tate Corp is shedding still more fat, cutting its US workforce by about 100 employees to bring its worldwide total down to 1,200. It also announced implementations of the Unix version of dBase IV for the IBM Corp RS/6000 under AIX 3.1 and for Sun Microsystems Inc’s old Sun-3 machines under SunOS 4.0, at $1,000 for a single-user licence or $3,000 for four simultaneous users.