Modifies the definition of an existing user result component or creates a new one if 'compName' does not exist. This method also allows renaming an existing user result component.
| compName | string | user result component name (existing or a new one) | 
| entityName | string | result entity name that this component is assigned to | 
| expression | string | expression that defines the result component values | 
| description | string | a user friendly description of the user result component | 
| newCompName | optional string | specifies a new name for this user component (the component must already exist) | 
| guiIndex | optional integer | index of this component in the GUI (it is added to the end of the list if not specified) | 
| Return value | Pointer to this object | Allows multiple function calls to be chained together | 
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