Disable introspection for gcr.

gcr stopped building after 7fbcc562 (adding introspection into GTK
libs); this gets it to build again.
Merge pull request #1018 from falsifian/fix_gcr

Disable introspection for gcr.
Wrapped R's package system similarly to perlPackages
screen: meta section cosmetic
haskell-active: update to version 0.1.0.7
haskell-amqp: update to version 0.6.0
haskell-cereal: update to version 0.4.0.0
haskell-classy-prelude-conduit: update to version 0.6.0
haskell-classy-prelude: update to version 0.6.0
haskell-data-lens: update to version 2.10.3
haskell-diagrams-core: update to version 0.7.0.1
haskell-diagrams-lib: update to version 0.7.1.1
haskell-dual-tree: update to version 0.1.0.4
haskell-generic-deriving: update to version 1.6.2
haskell-ghc-mod: update to version 3.1.2
haskell-groups: update to version 0.4.0.0
haskell-monoid-extras: update to version 0.3.2.2
haskell-ncurses: update to version 0.2.7
haskell-pandoc-types: update to version 1.12.1.2
haskell-regex-compat-tdfa: update to version 0.95.1.3