Cowell cluster notation

[Ryan Wieghard]

How hard would it be to add a Henry cowell cluster notation to lp? 

It could be like <aes des'>\makeCowellCluster

And then it would simply draw the top note head and bottom note head of the 
chord spelling . The only hard part would be drawing a very wide stem in 
between the top and bottom notes .  If anybody knows how To do the latter and 
if there is a repo I could make a PR to lp.

Thank ! Ryan 

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