ported changes from git@github.com:jetflav/IFNPlugin.git commit 6907232

Released version 2.1.0 of LundPlane

ready for version 2.1.0 release

fixed wrong sign in opposite-side primaries and extended python injection script

Released version 2.0.1 of LundPlane

updated authors list and version number

Released version 2.0.0 of LundPlane

added deprecated comment about old psi definition

updated ChangeLog, and rest of the changes

LundEEGenerator -> RecursiveLundEEGenerator

LundEEGenerator -> RecursiveLundEEGenerator

further copyright changes

copyright change

added recursive Lund e+e- generator, and spin-correlations example observables