Fix double freeing of memory in case when lexical error is detected by parser:
- revert previous fix, instead nullify the global buffer after its freeing in ExprIntrp_stop_string().
Added new QA command CR23403 and test case
Tricheck command improvement for checking triangulation holes on free links
More obvious error message
Added test case bugs demo CR23409
Modified test case offset wire_closed_outside_0_005 G7