Conjugate gradient #79
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This fixes the benchmark for the current conjugate gradient and remove matplotlib warnings in the doc.
There's also a "fully-pythonized" version of the scipy's conjugate gradient using Keops (with benchmarks) that has a better precision in some situations for the same computational time.
Also warnings (including a condition number warning for the added conjugate gradient) are present, stopping conditions are implemented to avoid any infinite loops and unit test for both the current and added methods are present.