BCES 2.0: Now with weighted least squares

I just released a major new version of BCES , the Python package for linear regression with measurement errors. In version 2.0, the big addition is weighted least squares (WLS) regression. What's new BCES has handled the case where both X and Y have measurement errors since version 1.0, using the bivariate correlated errors and intrinsic scatter method from Akritas & Bershady (1996) . But there's…