Unbound functions for filtering jets

Functions
Jets &	Rivet::iselect (Jets &jets, const Cut &c)
	Filter a jet collection in-place to the subset that passes the supplied Cut.
Jets	Rivet::select (const Jets &jets, const Cut &c)
	Filter a jet collection in-place to the subset that passes the supplied Cut.
Jets	Rivet::select (const Jets &jets, const Cut &c, Jets &out)
	Filter a jet collection in-place to the subset that passes the supplied Cut.
Jets &	Rivet::idiscard (Jets &jets, const Cut &c)
	Filter a jet collection in-place to the subset that fails the supplied Cut.
Jets	Rivet::discard (const Jets &jets, const Cut &c)
	Filter a jet collection in-place to the subset that fails the supplied Cut.
Jets	Rivet::discard (const Jets &jets, const Cut &c, Jets &out)
	Filter a jet collection in-place to the subset that fails the supplied Cut.

Detailed Description