Morisset/pyCloudy: 0.9.11

This new version is compatible with Cloudy 17.03. Some other bugs have been corrected

• avoid logQE to be infinity
• Change the new-form comment lines (thanks to jchowk) for c17.03 compatibility
• Add atomic mass from NIST
• Add abundance dictionnaries (Grevesse 98, Bressan, Asplund, Nicholls17 (as a function), depletions).
• Add 3MdB_17 make_PN2_21 and make_HII_21
• Add check_priority to avoid loosing time in the 3MdB running process.
• Add emergent keyword in the read_emis_file
• Add absolute keyword in set_emis_tab