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backend

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    Bruce Momjian authored
    * Changes the APIs to the timezone functions to take a pg_tz pointer as
    an argument, representing the timezone to use for the selected
    operation.
    
    * Adds a global_timezone variable that represents the current timezone
    in the backend as set by SET TIMEZONE (or guc, or env, etc).
    
    * Implements a hash-table cache of loaded tables, so we don't have to
    read and parse the TZ file everytime we change a timezone. While not
    necesasry now (we don't change timezones very often), I beleive this
    will be necessary (or at least good) when "multiple timezones in the
    same query" is eventually implemented. And code-wise, this was the time
    to do it.
    
    
    There are no user-visible changes at this time. Implementing the
    "multiple zones in one query" is a later step...
    
    This also gets rid of some of the cruft needed to "back out a timezone
    change", since we previously couldn't check a timezone unless it was
    activated first.
    
    Passes regression tests on win32, linux (slackware 10) and solaris x86.
    
    Magnus Hagander
    aa8bdab2
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