Resolved an issue introduced with #559
Implemented ticket #566 "Create 'assert' command"
Resolved some diverse issues resulting from SW test
Introduced a fix to implementation of ticket #471 -> Enabled other variable types for the window id than numerics.
Introduced a fix to implementation of ticket #471 -> Enabled other variable types for "item" than numerics.
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"