This improves forward-compatibility with base

It would seem strange to want to use `haskell2010` with Hugs which never
gained support for Haskell2010, so this commit removes that bitrotting
part of Prelude.hs. This reduces the CPP clutter to the point of not
requiring any CPP processing altogether anymore.

See also [b53c95fe621d3a66a82e6dad383e1c0c08f3871e/ghc]

The minor version bump is performed `haskell2010` now leaks the new
`Bits Bool` instance from `base-4.7.0.0`.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

 - Update to `cabal-version>=0.10`
 - add missing `Setup.hs`
 - add `Prelude` category
 - set proper version constraints
 - order module list according to H2010 report TOC
 - update homepage & bug-reports URL

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

The "apparent bug in GHC, reports a bogus warning for the Prelude import
below" doesn't seem to occur in GHC HEAD anymore.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

The behaviour of gcd was changed to "gcd 0 0 = 0", here we must keep
the haskell2010 behaviour and raise an error.