3abc

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In cubical mode I tried to use `hcomp` to fill a high dimensional cube. The performance is very bad. For the [6d-cube](https://gist.github.com/3abc/b8fa06a5b3fd14db8642fbd4ec8c9cc8) it takes about `100s` to type check. But...

performance
cubical

I used a lemma called `g2TruncFib` similar to `setTruncFib`. Just one remark, for `g2TruncFib` (and similarly `setTruncFib`) to work we don't need that `gP x` is a 2-groupoid for all...

For this definition ``` def comp3 (A : type) (b : (j0 j1: 𝕀) → A) (k0 : [j1 k] A [ k = 0 → b 0 j1]) (l0...