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Fix pt func

Vicentini Filippo requested to merge fix_pt_func into v2.1

Created by: gcarleo

This fixes parallel tempering samplers when using generic sampler functions. The current implementation would return wrong samples when sampling from |psi(x)| rather than the usual |psi(x)|^2.

Tests for correct sampling are also changed to something more robust (power divergence tests are now used, including a set of chi-squared and log-likelihood ratios tests).

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