added filtering scripts FilterD_phipi_ee.py, FilterD_phipi_mumu.py
Filtering scripts for MC production for D_phipi_ee and D_phipi_mumu for Rphipi analysis.
https://indico.cern.ch/event/792471/contributions/3328896/attachments/1807858/2951329/Dsphipi.pdf
Detailed cuts and rejection factors are documented in:
Edited by Davide Lancierini