Move everything to subdirectory

It's required for creating packages for extra instances

--HG--
rename : ChangeLog => fixed-vector/ChangeLog
rename : Data/Vector/Fixed.hs => fixed-vector/Data/Vector/Fixed.hs
rename : Data/Vector/Fixed/Boxed.hs => fixed-vector/Data/Vector/Fixed/Boxed.hs
rename : Data/Vector/Fixed/Cont.hs => fixed-vector/Data/Vector/Fixed/Cont.hs
rename : Data/Vector/Fixed/Generic.hs => fixed-vector/Data/Vector/Fixed/Generic.hs
rename : Data/Vector/Fixed/Internal.hs => fixed-vector/Data/Vector/Fixed/Internal.hs
rename : Data/Vector/Fixed/Monomorphic.hs => fixed-vector/Data/Vector/Fixed/Monomorphic.hs
rename : Data/Vector/Fixed/Mutable.hs => fixed-vector/Data/Vector/Fixed/Mutable.hs
rename : Data/Vector/Fixed/Primitive.hs => fixed-vector/Data/Vector/Fixed/Primitive.hs
rename : Data/Vector/Fixed/Storable.hs => fixed-vector/Data/Vector/Fixed/Storable.hs
rename : Data/Vector/Fixed/Unboxed.hs => fixed-vector/Data/Vector/Fixed/Unboxed.hs
rename : LICENSE => fixed-vector/LICENSE
rename : Setup.hs => fixed-vector/Setup.hs
rename : fixed-vector.cabal => fixed-vector/fixed-vector.cabal
rename : test/Doctests.hs => fixed-vector/test/Doctests.hs
rename : test/optimization/fuse-mapM.hs => fixed-vector/test/optimization/fuse-mapM.hs
rename : test/optimization/fuse-mk.hs => fixed-vector/test/optimization/fuse-mk.hs
rename : test/optimization/fuse-simple.hs => fixed-vector/test/optimization/fuse-simple.hs
rename : test/optimization/fuse-zipWith.hs => fixed-vector/test/optimization/fuse-zipWith.hs
rename : test/optimization/run.sh => fixed-vector/test/optimization/run.sh
Add packages for binary/cereal instances