Verifies if specified name was already used in w2ui object.
    checkName(params, component)
    
    
        | params | object, needs to have "name" property | 
    
        | component | string, which component is invoked (w2grid, w2form, w2tabs, etc.) | 
    
 
Returns bool.
Description
This method is used internally to check if the name for the object is unique and alphanumeric.