force_in in MatSelect() now correctly
accepts character column names.els now correctly lists all valid subsets when a single
variable is forced in.corrSelect() now displays an appropriate warning if
only one variable remains after dropping unsupported columns.assocSelect() now
safely falls back to 0 for failed or meaningless associations
(e.g. empty chi-squared tables due to sparse combinations or unused
factor levels).assocSelect() now supports logical columns by
automatically converting them to factors.