openlierox: fixing and updating.
gnulib: update to version 0.0-7901-g076ac82
perl-packages.nix, all-packages.nix: generally refer to 'postgresql' instead of 'postgresql92'

This allows users to override the 'postgres' attribute with a different version
and have the effect propagated to all other packages that depend on it.
perl-packages.nix: fix misplaced attribute from previous commit
haskell-hspec: update to version 1.5.3