doc: suggest cabal installing alex & happy also
These tools are needed for some deps, eg pretty-show and language-javascript, and may not have already been installed. Mentioning them explicitly may reduce a some installation hassles.
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@ -73,6 +73,7 @@ Use cabal
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## I want to build the [latest release](release-notes.html) with [GHC](http://haskell.org/ghc) and [cabal](http://haskell.org/cabal/download.html)
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`cabal install alex happy` (if you don't already have these in your path)\
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`cabal sandbox init; cabal update; cabal install hledger-web`\
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<!-- [cabal install guide](cabal-install.html) -->
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@ -82,5 +83,6 @@ The [Installation Guide](installing.html) describes how to install using cabal i
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## I want to build the [latest development code](http://hledger.org/code)
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`cabal install alex happy` (if you don't already have these in your path)\
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`git clone https://github.com/simonmichael/hledger; cd hledger; make sandbox install`
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