Added physical type for FLAM as per discussions in astropy/astropy#1386
Merge pull request #1410 from pllim/flam-phys-type

Added physical type for FLAM
Merge pull request #1407 from mhvk/units-scale-near-unity

Treat scales as unity if they are offset from unity at machine precision - solves #748
Remove less accurate/computationally stable angular distances
Rename vincenty... to angular_separation, update documentation
Expand spherical distance tests to include float, quantity, angle