NAME
        AllocChooserNodeA -- allocate a chooser node.

    SYNOPSIS
        struct node * allocchoosernode(tag, ...)
        node = AllocChooserNode(columns, tag, ...)

        struct node * allocchoosernodea(struct tagitem *)
        node = AllocChooserNodeA(taglist)

    FUNCTION
        Allocates a node that can be added to the Exec linked list of
        labels in the chooser.  This is the only way to allocate a
        node for this list, you cannot allocate nodes yourself because
        the Chooser class uses a private node structure.

    INPUTS
        taglist - Attributes for the node, passed onto setchoosernodeattrsa().

    RESULT
        node - A node that can be added into the Exec list of labels for
            a Chooser gadget.

    SEE ALSO
        freechoosernode(), setchoosernodeattrsa()