message: Code review : remove executable property
  Doc review : Rephrase inf_delta explanation
diff: @@ -61,7 +61,7 @@ def plot_persistence_barcode(persistence=[], persistence_file='', alpha=0.6,
  """This function plots the persistence bar code from persistence values list
  or from a :doc:`persistence file <fileformats>`.
  - :param persistence: Persistence values list.
  + :param persistence: Persistence intervals values list grouped by dimension.
  :type persistence: list of tuples(dimension, tuple(birth, death)).
  :param persistence_file: A :doc:`persistence file <fileformats>` style name
  (reset persistence if both are set).
  @@ -73,9 +73,9 @@ def plot_persistence_barcode(persistence=[], persistence_file='', alpha=0.6,
  Selected intervals are those with the longest life time. Set it
  to 0 to see all. Default value is 1000.
  :type max_intervals: int.
  - :param inf_delta: Infinity is placed at ((max_death - min_birth) x
  - inf_delta) above the highest point. A reasonable value is between
  - 0.05 and 0.5 - default is 0.1.
  + :param inf_delta: Infinity is placed at :code:`((max_death - min_birth) x
  + inf_delta)` above :code:`max_death` value. A reasonable value is
  + between 0.05 and 0.5 - default is 0.1.
  :type inf_delta: float.
  :param legend: Display the dimension color legend (default is False).
  :type legend: boolean.
  @@ -151,7 +151,7 @@ def plot_persistence_diagram(persistence=[], persistence_file='', alpha=0.6,
  """This function plots the persistence diagram from persistence values
  list or from a :doc:`persistence file <fileformats>`.
  - :param persistence: Persistence values list.
  + :param persistence: Persistence intervals values list grouped by dimension.
  :type persistence: list of tuples(dimension, tuple(birth, death)).
  :param persistence_file: A :doc:`persistence file <fileformats>` style name
  (reset persistence if both are set).
  @@ -165,9 +165,9 @@ def plot_persistence_diagram(persistence=[], persistence_file='', alpha=0.6,
  Selected intervals are those with the longest life time. Set it
  to 0 to see all. Default value is 1000.
  :type max_intervals: int.
  - :param inf_delta: Infinity is placed at ((max_death - min_birth) x
  - inf_delta) above the highest point. A reasonable value is between
  - 0.05 and 0.5 - default is 0.1.
  + :param inf_delta: Infinity is placed at :code:`((max_death - min_birth) x
  + inf_delta)` above :code:`max_death` value. A reasonable value is
  + between 0.05 and 0.5 - default is 0.1.
  :type inf_delta: float.
  :param legend: Display the dimension color legend (default is False).
  :type legend: boolean.
  @@ -251,7 +251,7 @@ def plot_persistence_density(persistence=[], persistence_file='',
  aware that this function does not distinguish the dimension, it is
  up to you to select the required one.
  - :param persistence: Persistence values list.
  + :param persistence: Persistence intervals values list grouped by dimension.
  :type persistence: list of tuples(dimension, tuple(birth, death)).
  :param persistence_file: A :doc:`persistence file <fileformats>`
  style name (reset persistence if both are set).
  