[all] Fix warnings

[hugtalbot]

Voilà.

Maybe @epernod a check on the SofaPhysicsSimulation with the various Fore/Background member variables.

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[epernod]

No idea what is this code for.

[hugtalbot]

I let you pass it to ready @epernod 💌

[hugtalbot]

Further to @fredroy 's request I added changes in CompressedRowSparseMatrixMechanical
Could you check what I did @alxbilger , do you think this could affect performances?

[hugtalbot]

[ci-build][with-all-tests]

[alxbilger]

Further to @fredroy 's request I added changes in CompressedRowSparseMatrixMechanical Could you check what I did @alxbilger , do you think this could affect performances?

Casting may introduce a performance cost. However, here the cast is on a constant, which means the compiler is probably able to cast it at compile-time. But the only way to be sure is to read the assembly code...