Christoph Finkensiep

For the following input, brittany produces invalid output: ```haskell {-# LANGUAGE DataKinds #-} -- this fails type A x y = '[ '(x, y)] type B x = '[ '[x]]...

implement iterator interface on plist completely

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This PR adds `Base.iteratorsize`, `Base.iteratoreltype` and `Base.eltype` for `plist`. Especially the last one is important, as it allows `collect` to infer the eltype of the output array correctly. Tests included.

cannot construct nested lists

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The following fails: ```julia julia> list(list(1), list(1)) ``` with ```julia ERROR: MethodError: colon(::Lazy.LinkedList, ::Lazy.LinkedList) is ambiguous. Candidates: colon(x, xs::Lazy.List) in Lazy at /home/chfin/.julia/v0.6/Lazy/src/Lazy.jl:62 colon(start::T, stop::T) where T in Base at...

In n09op59-3_01 m. 113, the label after the key change says `I64(7#4)`, but the `#4` should be `#2` (F# in an Eb chord). I find the label a bit strange...

- store a hash with the filename - only do incremental updates (check hash) - pdf output