version 4/080915 by Mikael Segercrantz
Section 2a13 - Before going fore (for use with Shipboard Directions by Mikael Segercrantz)
Before going fore:
let table-of-exits be exits fore of the location;
if the number of filled rows in table-of-exits is 0, continue the action;
modify the fore exit of the location according to table-of-exits.