~/.cabal/config: add configuration for haskell's cabal

`require-sandbox` is mandatory.

.cabal/config

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-- This is the configuration file for the 'cabal' command line tool.
-- The available configuration options are listed below.
-- Some of them have default values listed.
-- Lines (like this one) beginning with '--' are comments.
-- Be careful with spaces and indentation because they are
-- used to indicate layout for nested sections.
-- Cabal library version: 1.22.0.0
-- cabal-install version: 1.22.0.0
require-sandbox: True
-- ignore-sandbox: False
remote-repo: hackage.haskell.org:http://hackage.haskell.org/packages/archive
remote-repo-cache: /home/lu/.cabal/packages
-- local-repo:
logs-dir: /home/lu/.cabal/logs
world-file: /home/lu/.cabal/world
verbose: 1
compiler: ghc
-- with-compiler:
-- with-hc-pkg:
-- program-prefix: 
-- program-suffix: 
-- library-vanilla: True
-- library-profiling:
-- shared:
-- executable-dynamic: False
-- profiling:
-- optimization: True
-- debug-info: False
-- library-for-ghci:
-- split-objs: False
-- executable-stripping: True
-- library-stripping: True
-- configure-option:
user-install: True
-- package-db:
-- flags:
-- extra-include-dirs:
-- extra-lib-dirs:
extra-prog-path: /home/lu/.cabal/bin
-- instantiate-with:
-- tests: False
-- library-coverage:
-- coverage: False
-- exact-configuration: False
-- benchmarks: False
-- relocatable: False
-- cabal-lib-version:
-- constraint:
-- preference:
-- solver: choose
-- allow-newer: False
-- documentation: False
-- doc-index-file: $datadir/doc/$arch-$os-$compiler/index.html
-- max-backjumps: 2000
-- reorder-goals: False
-- shadow-installed-packages: False
-- strong-flags: False
-- reinstall: False
-- avoid-reinstalls: False
-- force-reinstalls: False
-- upgrade-dependencies: False
-- root-cmd:
-- symlink-bindir:
build-summary: /home/lu/.cabal/logs/build.log
-- build-log:
remote-build-reporting: anonymous
-- report-planning-failure: False
-- one-shot: False
-- run-tests:
jobs: $ncpus
-- username:
-- password:
haddock
  -- keep-temp-files: False
  -- hoogle: False
  -- html: False
  -- html-location:
  -- executables: False
  -- tests: False
  -- benchmarks: False
  -- all:
  -- internal: False
  -- css:
  -- hyperlink-source: False
  -- hscolour-css:
  -- contents-location:
install-dirs user
  prefix: /home/lu/.cabal
  -- bindir: $prefix/bin
  -- libdir: $prefix/lib
  -- libsubdir: $abi/$pkgkey
  -- libexecdir: $prefix/libexec
  -- datadir: $prefix/share
  -- datasubdir: $abi/$pkgid
  -- docdir: $datadir/doc/$abi/$pkgid
  -- htmldir: $docdir/html
  -- haddockdir: $htmldir
  -- sysconfdir: $prefix/etc
install-dirs global
  -- prefix: /usr/local
  -- bindir: $prefix/bin
  -- libdir: $prefix/lib
  -- libsubdir: $abi/$pkgkey
  -- libexecdir: $prefix/libexec
  -- datadir: $prefix/share
  -- datasubdir: $abi/$pkgid
  -- docdir: $datadir/doc/$abi/$pkgid
  -- htmldir: $docdir/html
  -- haddockdir: $htmldir
  -- sysconfdir: $prefix/etc
program-locations
  -- alex-location:
  -- ar-location:
  -- c2hs-location:
  -- cpphs-location:
  -- gcc-location:
  -- ghc-location:
  -- ghc-pkg-location:
  -- ghcjs-location:
  -- ghcjs-pkg-location:
  -- greencard-location:
  -- haddock-location:
  -- happy-location:
  -- haskell-suite-location:
  -- haskell-suite-pkg-location:
  -- hmake-location:
  -- hpc-location:
  -- hsc2hs-location:
  -- hscolour-location:
  -- jhc-location:
  -- ld-location:
  -- lhc-location:
  -- lhc-pkg-location:
  -- pkg-config-location:
  -- strip-location:
  -- tar-location:
  -- uhc-location:
program-default-options
  -- alex-options:
  -- ar-options:
  -- c2hs-options:
  -- cpphs-options:
  -- gcc-options:
  -- ghc-options:
  -- ghc-pkg-options:
  -- ghcjs-options:
  -- ghcjs-pkg-options:
  -- greencard-options:
  -- haddock-options:
  -- happy-options:
  -- haskell-suite-options:
  -- haskell-suite-pkg-options:
  -- hmake-options:
  -- hpc-options:
  -- hsc2hs-options:
  -- hscolour-options:
  -- jhc-options:
  -- ld-options:
  -- lhc-options:
  -- lhc-pkg-options:
  -- pkg-config-options:
  -- strip-options:
  -- tar-options:
  -- uhc-options: