Support for other operators and nested functions in the function editor
We need to support functions also for:
- other operators (<, >, =, <=, >=, !=) and
- nested functions.
For example, this function doesn't work now:
- if(greaterThan(x;2);1;if(greaterThan(x;3);2;0).
A related issue: #418
Edited by Dariusz Laska