Add orbital and text objects to bonds.
Object
Bonds can be linked only to objects below: 
Orbital 
or 
Text (the default).
Gamgi expects users to identify first the bond or list of bonds
and then the object to link. When the 
Bond entry is active 
and empty, clicking the mouse over a bond, on the current layer
(local selection), its identification is transported to the 
Bond entry. Gamgi is now expecting users to click on 
a object of the class currently selected in the 
Object menu. 
This object can be in a different layer or even in a different 
window (global selection). To select a visible object in a different 
layer, in the same window, just press the mouse over the object, 
as if it was in the current layer. To select a visible object in 
a different window, with the mouse, use exactly the same procedure, 
in that window.
Link
Gamgi suppports only one type of linking mode for Bond: 
Object.
The selected object is unlinked from its current parent and linked to 
the bond. An error is issued when the selected object was already in 
the bond.
After the linking operation, Gamgi always puts on top
the window and layer containing the linked objects.