@SET (player) = ( BUILDER | CONSTRUCTOR | CREATOR )
DragonMud restricts building commands to BUILDER players.
Only builders can @create, @dig, @link, @open, or pick up
@makegroup does not require a builder bit.
The BUILDER/CONSTRUCTOR/CREATOR flag is only meaningful for players.
(On (things) the same flag indicates COPY-object status.)
Only Gods can set this flag on others.
Wizards can set it on themselves.