\f$ \Delta phi \f$ calculations from 3-vectors

Functions
double	Rivet::deltaPhi (const Vector3 &a, const Vector3 &b, bool sign=false)
	Calculate the difference in azimuthal angle between two spatial vectors.
double	Rivet::deltaPhi (const Vector3 &v, double phi2, bool sign=false)
	Calculate the difference in azimuthal angle between two spatial vectors.
double	Rivet::deltaPhi (double phi1, const Vector3 &v, bool sign=false)
	Calculate the difference in azimuthal angle between two spatial vectors.

Detailed Description