[PATCH] renderLayout1Matrix and mapMaybePickFn

[Stefan Kersten]

i've attached two patches that add the following functions:

* renderLayout1Matrix: renders a matrix of Layout1's in a grid so that
their axes and axis labels are aligned
* mapMaybePickFn: apply a function to a PickFn result and keep only
values wrapped in Just; btw, couldn't Renderable be a Functor with fmap
= mapPickFn?

<sk>

[Tim Docker]

Hi Stefan,

I've pushed the "mapMaybePickFn" patch.

The other patch looks ok - but can you provide a test case, so that:
- I can see what it looks like
- it gets tested on an ongoing basis?

thanks,

Tim