mdtraj xyz unit

[yueyericardo]

The mdtraj's xyz unit seems not in angstrom.
For example, a line in 2iuz_ligand.mol2, mdtraj will give it position as [ 9.5347, 6.6904, -0.6262]

1 O6         95.3475   66.9041   -6.2620 zf         1 D1H     -0.627500

This PR is to fix this issue by multiply mol.xyz with 10.
Also add timing in BenchmarkCudaANISymmetryFunctions.cu

[peastman]

@raimis does this look ok to you?

[raimis]

Thanks @yueyericardo! Apparently, I have missed the conversion form nm to Å.

@peastman, it is good for me.

[peastman]

Ok, thanks!