Change some labels in bootparse to make ctags happy.  Clean up outfunc/readfunc code and add missing fields for Query structure and new Union fields.  Fix optimizer bug shown in new \do command.  Change WARN to ERROR in contrib and regression stuff.

From: Tom I Helbekkmo <tih@Hamartun.Priv.NO>

need to include string.h for strdup()

From: Bryan Henderson <bryanh@giraffe-data.com>

Comment-out dynamic link function declarations since they are all
 provided by the system.
Should we bother continuing to support non-elf Linux systems??

Change declarations from "struct varlena *" to "text *".
Remove register variables since compiler should do better on its own.

Change NOTICE/NOTICE/NOTICE/WARN elog messages to a single message
 with a few newline/tab breaks embedded in the string. Much cleaner I hope.

 closer to standard behavior.
Substitute "text *" for "struct varlena *" in declarations.

 sigsetjmp as a macro, so gives compiler warning without bracketing.

From: Ryan Kirkpatrick <rkirkpat@nag.cs.colorado.edu>

From: Ryan Kirkpatrick <rkirkpat@nag.cs.colorado.edu>

  o  A new patch that contains the following changes:
        -- The pg_pwd file is now cached in the postmaster's memory.
        -- pg_pwd is reloaded when the postmaster detects a flag file creat()'ed
           by a backend.
        -- qsort() is used to sort loaded password entries, and bsearch() is
           is used to find entries in the pg_pwd cache.
        -- backends now copy the pg_user relation to pg_pwd.pid, and then
           rename the temp file to be pg_pwd.
        -- The delimiter for pg_pwd has been changed to a tab character.