Fixed some typos and language imprecisions in doc/tutorials/advanced/checkpoint.rst

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Merge

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Merge.

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Deprecate and remove lambdify, stringify and evaluate, introducing compile.

gp.compile is simply a merge of lambdify and evaluate. If the
primitive set has one or more argument, compile build a lambda
function, while if the number of argument is zero, it simply
returns the result produced by evaluating the tree.

compile appears to be better choice of word than evaluate and
lambdify, while reducing the number of functions to build an
expression from a tree to a single one.

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Fixed various typos and language-related issues in tutorials/advanced/benchmarking.rst

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Fixed typos and other language-related issues in doc/tutorials/advanced/gp.rst

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Merge.

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Fixed typos and other language-related issues in doc/tutorials/basic/part1.rst

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Rename create argument name and base to classname and baseclass.

This avoid possible conflict with attribute that could be
added to a new class.

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Remove importation of pdb in the from_string function.

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Add the name attribute when creating a new Ephemeral class.

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Merge.

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Remove call to stringify in coev/symbreg example.

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Merge.

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Adds the posibility to use iterables in the mutation for bounds and gaussian parameters.

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Changed the Simulated Binary crossover bounds from sequences to iterables as in the mutation.

Precised the types requirements for the crossovers.

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Corrected the spelling mistakes.

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Agains corrected the overcomplicated docstrings.

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Bring back the banchmarks into the doc.

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Make the "iterable" links point to the python documentation and not the numpy documentation.

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