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2015-03-25 Ferruccio Guidi- revision of ground_2 and basic_2
2014-10-26 Ferruccio Guidi- some renaming according to the written version of...
2014-09-15 Ferruccio Guidinotational change of lift, drop, and gget
2014-06-01 Ferruccio Guidi- some refactoring and minor additions
2013-04-20 Ferruccio Guidi- we are committing just the components before "reducib...
2012-12-25 Ferruccio Guidi- lambda_delta: programmed renaming to lambdadelta