Ripsnet tutorial

[VincentRouvreau]

• Replaces ripsnet tutorial #59
• Includes ripsnet gudhi-devel#587 (that won't be in main gudhi project)
  • User manual is copied at the beginning of the tutorial ina dedicated section
  • RipsNet code is in tutorials/gudhi_extra directory and can be called by from gudhi_extra.tensorflow import RipsNet
• Fix PersistenceImage and Landscape that were called with transform, but were requiring a fit_transform call
• In RipsNet.call method, I replaced inputs = tf.keras.layers.InputLayer(input_shape=(None, self.input_dim), dtype="float32", ragged=True)(pointclouds) (was failing) with inputs = tf.cast(pointclouds, dtype="float32")
• In RipsNet.__init__ constructor, I uncomment the exception that is thrown when perm_op is unknown (useful from a user point of view)
• Before constructing the dataset with create_multiple_circles, I added a call to numpy.random.seed(42) for reproductible results (and a comment)

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