#273 Graph drawing sublayouts fails.

[Till Tantau]

Graph drawing with sublayouts fails:

\tikz \graph [tree layout] {
foo [draw] // [layered layout] {
a -- b -- {c,d} -- e -- a
};

bar [draw] // [layered layout] {
e -- f -- {x,y}
};

foo -> bar;
};

[Till Tantau]

Fixed in CVS.