Mech fabricator fix
Mech fabs were looking in their lighting sub-area to connect to equipment in their logical area; if the mech fab and the R&D computer were at different lighting levels, they would cease to be in the same area, making them fail to connect.  This adds a global helper proc to return the contents of a logical area rather than the lighting sub-area.
Makes failing to connect to an R&D computer a recoverable error.
Merge pull request #525 from SuperSayu/mechfab-fix

Mech fabricator fix