Remove gratuitous response messages from utility programs.

(Possibly release notes material, lest users be confused.)

The --quiet option is now obsolete and without effect in createdb,
createuser, dropdb, dropuser; kept for compatibility but marked for
removal in 8.4.

Progress messages when acting on all databases now go to stdout instead
of stderr, since they are not in fact errors.

Ordered options in reindexdb reference page alphabetically, like in
other programs' pages.