title: Iphone. Create a latitude from a string or integers
body: <p>One small conversion problem that drives me crazy.</p>
  
  <p>I have a string (ex "35.453454") that represents a latitude.
  I want to use it as a latitude for CLLocation.</p>
  
  <p>How can I convert the string in the proper CLLocation (in degrees) format ?</p>
  
  <p>Many thanks, this drives me so mad !
  Thomas</p>