Signed integer overflow
The result of numeric operations can overflow in some cases. E.g.:
```
module proba {
control{
var integer a:=2147483647
action("!!!" , a)
a:=a+1
action("!!!" , a)
}
}
```
Will result:
```
TCN-3 Test Executor (single mode), version 11.0.0
Execution of control part in module proba started.
Action: !!!2147483647
Action: !!!-2147483648 <-ez itt negative
Execution of control part in module proba finished.
Verdict statistics: 0 none, 0 pass, 0 inconc, 0 fail, 0 error.
Test execution summary: 0 test case was executed. Overall verdict: none
```
issue