propogated by copy and paste.

1. Primarily the "empty variable" default assignment, which is mostly
${name}_flags="", but fix a few others as well.
2. Where they are not already documented, add the existence of the _flags
(or other deleted empties) option to the comments, and in some cases add
comments from scratch.
3. Replace things that look like:
prefix=%%PREFIX%%
command=${prefix}/sbin/foo
to just use %%PREFIX%%. In many cases the $prefix variable is only used
once, and in some cases it is not used at all.
4. In a few cases remove ${name}_flags from command_args
5. Remove a long-stale comment about putting the port's rc.d script in
/etc/rc.d (which is no longer necessary).

No PORTREVISION bumps because all of these changes are noops.

Release notes:
http://www.postgresql.org/docs/7.3/static/release.html#RELEASE-7-3-17
http://www.postgresql.org/docs/7.4/static/release.html#RELEASE-7-4-15
http://www.postgresql.org/docs/8.0/static/release.html#RELEASE-8-0-10
http://www.postgresql.org/docs/8.1/static/release.html#RELEASE-8-1-6
http://www.postgresql.org/docs/8.2/static/release-8-2-1.html

The server-side utilities of postgresql (initdb, initlocation,
ipcclean, pg_controldata, pg_ctl, pg_id and pg_resetxlog) are now
installed by the respective postgresql*-server port (previously they
where installed with the client). If you update the client, you should
also update the server to make sure you are not left without the
server-side tools. Do something like:

    portupgrade postgresql-client postgresql-server

PostgreSQL 8.2.0

Complete release notes are available at
http://www.postgresql.org/docs/current/static/release-8-2.html