MPTab() /* move over a tab stop */
/* This is meant to go in conjunction with the tab set/clear in TABS.C
Contributed to the AUG by Mark of the Unicorn 07/20/81 */
{
for (cnt=BGetCol(); cnt<80; && (++cnt,!(spare[cnt>>3]&(1<<(cnt&7))));
ForceCol (cnt+1,FORWARD);
}