Announcing secr 5.1

[murray.efford]

Announcing, belatedly, that version 5.1 of secr is available on CRAN. Version 5.0 introduced significant changes and these were consolidated in 5.1.0:
o MCgof() goodness-of-fit after Choo et al. (2024) DOI: 10.1111/2041-210X.14386
o blackbearCH new dataset of J. Laufenberg, F. van Manen and J. Clark
o default criterion for AIC and modelAverage changed from AICc to AIC
o some functions renamed
o etc.