Log Message:
Changes 8.3.11:
* Enforce restrictions in plperl using an opmask applied to the whole
  interpreter, instead of using "Safe.pm"
* Prevent PL/Tcl from executing untrustworthy code from pltcl_modules
* Fix possible crash if a cache reset message is received during
  rebuild of a relcache entry
* Apply per-function GUC settings while running the language
  validator for the function
* Do not allow an unprivileged user to reset superuser-only parameter
  settings
* Avoid possible crash during backend shutdown if shutdown occurs
  when a CONTEXT addition would be made to log entries
* Ensure the archiver process responds to changes in archive_command
  as soon as possible
* Update pl/perl's "ppport.h" for modern Perl versions
* Fix assorted memory leaks in pl/python
* Prevent infinite recursion in psql when expanding a variable that
  refers to itself
* Fix psql's \copy to not add spaces around a dot within \copy
  (select ...)
* Fix unnecessary "GIN indexes do not support whole-index scans"
  errors for unsatisfiable queries using "contrib/intarray" operators
* Ensure that "contrib/pgstattuple" functions respond to cancel
  interrupts promptly
* Make server startup deal properly with the case that shmget()
  returns EINVAL for an existing shared memory segment
* Avoid possible crashes in syslogger process on Windows
* Deal more robustly with incomplete time zone information in the
  Windows registry
* Update the set of known Windows time zone names
* Update time zone data files to tzdata release 2010j for DST law
  changes in Argentina, Australian Antarctic, Bangladesh, Mexico,
  Morocco, Pakistan, Palestine, Russia, Syria, Tunisia; also
  historical corrections for Taiwan.
  Also, add PKST (Pakistan Summer Time) to the default set of
  timezone abbreviations.