This has a variety of fixes from 7.3.3.
A dump/restore is not required for those running 7.3.*.
Repair breakage in timestamp-to-date conversion for dates before 2000
Prevent rare possibility of server startup failure (Tom)
Fix bugs in interval-to-time conversion (Tom)
Add constraint names in a few places in pg_dump (Rod)
Improve performance of functions with many parameters (Tom)
Fix to_ascii() buffer overruns (Tom)
Prevent restore of database comments from throwing an error (Tom)
Work around buggy strxfrm() present in some Solaris releases (Tom)
Properly escape jdbc setObject() strings to improve security (Barry)