node-symbol can probably be a string

[waywardmonkeys]

From a quick inspection:

batavia:command-interface bruce (master) $ git grep node-symbol
command-interface/building.dylan:        if (instance?(s, <symbol-node>) & (node-symbol(s) == symbol))
command-interface/help.dylan:      cmd-title := add(cmd-title, as(<string>, node-symbol(node)));
command-interface/nodes.dylan:  slot node-symbol :: <symbol>,
command-interface/nodes.dylan:  format(stream, "%s", node-symbol(object));
command-interface/nodes.dylan:  as(<string>, node-symbol(node));
command-interface/nodes.dylan:  starts-with?(as(<string>, node-symbol(node)),
command-interface/nodes.dylan:                  complete-options: list(as(<string>, node-symbol(node))));
command-interface/nodes.dylan:  format(stream, "%s - %s", node-symbol(object), command-help(object));
command-interface/nodes.dylan:                  complete-options: list(as(<string>, node-symbol(node))));
command-interface/nodes.dylan:  concatenate(as(<string>, node-symbol(node)),
command-interface/nodes.dylan:  starts-with?(as(<string>, node-symbol(node)),
command-interface/nodes.dylan:                  complete-options: list(as(<string>, node-symbol(node))));

Almost every use is treating it as a string.