Log Message:
-----------
Insert ARST into the list of known timezone abbreviations.
Modified Files:
--------------
pgsql/src/timezone/tznames:
America.txt (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/America.txt?r1=1.2&r2=1.3)
Default (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/timezone/tznames/Default?r1=1.3&r2=1.4)