Fix conflicting impls for isometry multiplication.
use alga::general::{AbstractGroup, AbstractLoop, AbstractMagma, AbstractMonoid,
AbstractQuasigroup, AbstractSemigroup, Id, Identity, Inverse, Multiplicative,
Real};
+use alga::linear::Isometry as AlgaIsometry;
use alga::linear::{AffineTransformation, DirectIsometry, ProjectiveTransformation, Rotation,
Similarity, Transformation};
-use alga::linear::Isometry as AlgaIsometry;
-use core::{DefaultAllocator, VectorN};
-use core::dimension::DimName;
use core::allocator::Allocator;
+use core::dimension::DimName;
+use core::{DefaultAllocator, VectorN};
use geometry::{Isometry, Point, Translation};
