Doc update: need to mention postgresql-crypto, update man pages
This is a follow-up to 0.6.0 sanity checks and @marcin comments:
-
postgresql-crypto needed on Fedora, postgresql12-contrib on RHEL/CentOS: #227 (comment 122038) -
agent man page improvement: #227 (comment 122053) -
bring server man page up to date: #227 (comment 122056) -
su - postgres
missing in the docs (reported by Wlodek, see stork call 2020-05-05 notes, line 50)