REL_14_21
Have crosstab variants treat NULL rowid as a category in its own right, per suggestion from Tom Lane. This fixes crash-bug reported by Stefan Schwarzer.
tablefunc: Reject negative number of tuples passed to normal_rand()
Support "make check" in contrib
Remove support for upgrading extensions from "unpackaged" state.
Throw a useful error message if an extension script file is fed to psql.
Update copyright for 2021
Mark some contrib modules as "trusted".