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qrjoint 2.1-0

• The C computational engine has been rewritten in Rcpp/RcppArmadillo, replacing the legacy .C() interface. qde() and qrjoint() now share a single underlying engine.
• Fixed a bug in qrjoint() (not qde()) where observations with zero weight (wt = 0) could produce NaN in the log-posterior, potentially freezing the MCMC chain. Zero-weight observations now correctly contribute nothing to the likelihood, as documented. This has no effect on models fit with the default (all nonzero) weights.
• Performance improvements, all exact (no change to the statistical model): Gaussian-process components are now cached and only recomputed for the MCMC blocks that actually change them; a redundant per-grid-point quantile-function evaluation in the base distribution is now computed once per log-posterior evaluation instead of once per grid point; and the per-observation quantile-bracket search now uses binary search instead of a linear scan. Combined, these give roughly a 1.7-1.9x speedup on typical problem sizes with identical statistical results.
• Added a more numerically robust Cholesky factorization for the adaptive proposal covariance, with jitter-based recovery on failure instead of silently propagating NaN.
• Updated the redmaple data source URL in the documentation.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.