Resolved an issue in implementation of ticket #555
Fixed issue #565 "Using a cluster for string comparison overwrites its contents"
Resolved an issue in implementation of ticket #548
Implemented ticket #555 "Transform procedure arguments into real variables"
Implemented ticket #564 "Extend 'totable' option"
Implemented ticket #563 "Create possibility to keep empty lines during 'read'"
Implemented ticket #561 "Install info field for license information"
Implemented ticket #560 "New documentation keyword '\return'"
Implemented ticket #552 "Make new GUI feature installable"
Deleted merged branch