postmaster/postgres options assimilation plan

Here's the plan for assimilating the command-line options of the postmaster 
and postgres options.  I reported earlier on a couple of conflict areas; here 
is the full plan:

* Remove: postmaster -a -b -m -M

These options have done nothing forever.

* postmaster options added to postgres: -h -i -k -l -n

These options will not have any useful effects, but their behavior is 
consistent if you do, say, SHOW listen_addresses.

* postgres options added to postmaster: -e -E -f -O -P -t -W

Using -E with postmaster does nothing, though.

* Renamed options (because of conflicts):

postgres -N is now postgres -j (mostly internal use)

postgres -o is now postgres -r (mostly internal use)

(postmaster -o is obsolete but still works for compatibility; postgres -o will 
get you an error.)

postgres -p is now postgres -y (internal use only)

postmaster -S now sets work_mem, like postgres -S does.  The (deprecated) 
silent mode can be obtained using the long option --silent-mode=on.

postmaster -s is now postmaster -T (expert/hacker use only)


For the options -O, -P, and -W I have added three new GUC variables 
allow_system_table_mods (PGC_SIGHUP), ignore_system_indexes (PGC_BACKEND), 
connection_startup_delay (PGC_BACKEND); mostly to simplify the 
postmaster->postgres communication.

Except for a few odd exceptions, all command line arguments now map to setting 
a GUC variable.

Comments?