message: Code review: Contraction only depends on CGAL_queue/Modifiable_priority_queue.h which is LGPL, not GPL
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  <b>Author:</b> David Salinas<br>
  <b>Introduced in:</b> GUDHI 1.1.0<br>
  - <b>Copyright:</b> MIT [(GPL v3)](../../licensing/)<br>
  + <b>Copyright:</b> MIT [(LGPL v3)](../../licensing/)<br>
  <b>Requires:</b> \ref cgal &ge; 4.11.0
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