Pretty print long commands

I was trying to debug a problem and turned on verbose mode. The output of verbose seems pretty unreadable. I was interested in looking at what flags or command line options are being used for cabal. This is the output that I saw:

> 2016-02-24 18:35:37.653768: [debug] Run process: /var/home/harendra/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.22.5.0-ghc-7.10.3 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.22.5.0 configure --with-ghc=/var/home/harendra/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc --with-ghc-pkg=/var/home/harendra/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc-pkg --user --package-db=clear --package-db=global --package-db=/var/home/harendra/.stack/snapshots/x86_64-linux/lts-5.4/7.10.3/pkgdb --package-db=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/pkgdb --libdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/lib --bindir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/bin --datadir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/share --libexecdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/libexec --sysconfdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/etc --docdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0 --htmldir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0 --haddockdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0 --dependency=base=base-4.8.2.0-0d6d1084fbc041e1cded9228e80e264d --dependency=conduit=conduit-1.2.6.2-bbb6e8792dc10ebfaa0881ed8bfacb02 --dependency=filepath=filepath-1.4.0.0-f97d1e4aebfd7a03be6980454fe31d6e --dependency=resourcet=resourcet-1.1.7.2-78775b086032749956bd24405bc310bc --dependency=transformers=transformers-0.4.2.0-81450cd8f86b36eaa8fa0cbaf6efc3a3 --ghc-options -E --enable-tests --enable-benchmarks @(stack_62J5TCkgvzXEzDvUwWp35R:System.Process.Read src/System/Process/Read.hs:269:3)

I had to use `tr` on this to make some sense out of it:

```
| tr ' ' '\n'
2016-02-24
18:35:37.653768:
[debug]
Run
process:
/var/home/harendra/.stack/setup-exe-cache/x86_64-linux/setup-Simple-Cabal-1.22.5.0-ghc-7.10.3
--builddir=.stack-work/dist/x86_64-linux/Cabal-1.22.5.0
configure
--with-ghc=/var/home/harendra/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc
--with-ghc-pkg=/var/home/harendra/.stack/programs/x86_64-linux/ghc-7.10.3/bin/ghc-pkg
--user
--package-db=clear
--package-db=global
--package-db=/var/home/harendra/.stack/snapshots/x86_64-linux/lts-5.4/7.10.3/pkgdb
--package-db=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/pkgdb
--libdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/lib
--bindir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/bin
--datadir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/share
--libexecdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/libexec
--sysconfdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/etc
--docdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0
--htmldir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0
--haddockdir=/vol/hosts/cueball/workspace/projects/xls/.stack-work/install/x86_64-linux/lts-5.4/7.10.3/doc/xls-0.1.0.0
--dependency=base=base-4.8.2.0-0d6d1084fbc041e1cded9228e80e264d
--dependency=conduit=conduit-1.2.6.2-bbb6e8792dc10ebfaa0881ed8bfacb02
--dependency=filepath=filepath-1.4.0.0-f97d1e4aebfd7a03be6980454fe31d6e
--dependency=resourcet=resourcet-1.1.7.2-78775b086032749956bd24405bc310bc
--dependency=transformers=transformers-0.4.2.0-81450cd8f86b36eaa8fa0cbaf6efc3a3
--ghc-options
-E
--enable-tests
--enable-benchmarks
@(stack_62J5TCkgvzXEzDvUwWp35R:System.Process.Read
src/System/Process/Read.hs:269:3)
```

It will be helpful in debugging if we can pretty print the long command outputs by default.