Edouard Tisserant <edouard.tisserant@gmail.com> [Fri, 02 Mar 2018 17:01:25 +0100] rev 1973
merged Sergeys changes
Surkov Sergey <surkovsv93@gmail.com> [Mon, 19 Feb 2018 19:36:43 +0300] rev 1972
fix bug with indelible values in some 'optional' fields in project properties panel
only 'required' fields should be indelible