pretection against round-off errors of 4-vectors with masses around 0 (e.g. photons) in dyn functions

fixed d-functions for prod decays in e+e-; introduced background terms for P-vector; added particles in pdt-table

introduced generic l-dependent k-matrix calculations; bug fix in BlattW barrier calculations for complex momenta

Minor changes in PwaDynamics/RadMultipoleFormFactor and bug fix for '-nan'-photon masses, switched workaround is-photon-check to mass squared

added simple Blatt-Weisskopf factors w/o any mass shape for dynamics; qR value as argument for BreitWignerBlattWRelDynamics

templated several functions to allow for complex masses, added class to scan riemann sheets, updated TMatrix test app