Announcing secr 3.1.6

secr 3.1.6 is now on CRAN. A new function CVpdot computes the CV of site-specific detection probability p.(x) across a mask. Intervals and session labels are handled correctly by the subset and reduce methods for capthist objects; time-varying individual covariates may be defined for use in openCR. A couple of bugs are fixed; see https://cran.r-project.org/web/packages/secr/NEWS for specifics.