Release of gems 3.9.7

Release of GEM-Selektor v.3.9.7 package download

• fixed for calculation of ReacDC record properties at Tr and Pr other than 25 C 1 bar
• fixed water standard properties as in CODATA89/NEA, conversion from steam table
• fixed assignment of water properties for LVS model above critical T
• Added buttons 'Select all' and 'Clear Selection' on the basis configuration of a new Modelling Project.
• bugfixes