Support for hmatrix 0.17

[nh2]

With hmatrix 0.17 the compilation fails; one reason is because of deprecated modules being removed there (they just moved to the main hmatrix module, that's easy to fix); the other one is that one can no longer do

deriving instance (Eq r, Container Vector r) => Eq (Constraints r)

it has to be

deriving instance (Eq r, Container Vector r, Num r) => Eq (Constraints r)

now (wants a Num constraint). Does it make sense to add this constraint to this instance?

[basvandijk]

Thanks for the heads-up. This should now be fixed in 1.2.1.6.