FoReco 1.3.1

• User-facing functions now validate their arguments more strictly and fail with informative error messages that state the expected value and report the one actually supplied, replacing the previous generic diagnostics.
• Replaced any(is.na()) with anyNA().
• Internal helpers, S3 methods underlying the generics (e.g. the cscov(), tecov() and ctcov() methods) and the soft-deprecated res2matrix() are no longer listed in help(package = "FoReco"), so the help index now exposes only the user-facing functions.
• Fixed the single-column name produced by as.data.frame() on a foreco object, which now uses the name of the object supplied by the user.