pgsql: DROP DATABASE IF EXISTS variant

Log Message:
-----------

 DROP DATABASE IF EXISTS variant

Modified Files:
--------------
    pgsql/doc/src/sgml/ref:
        drop_database.sgml (r1.20 -> r1.21)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/drop_database.sgml.diff?r1=1.20&r2=1.21)
    pgsql/src/backend/commands:
        dbcommands.c (r1.173 -> r1.174)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/dbcommands.c.diff?r1=1.173&r2=1.174)
    pgsql/src/backend/nodes:
        copyfuncs.c (r1.319 -> r1.320)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/copyfuncs.c.diff?r1=1.319&r2=1.320)
        equalfuncs.c (r1.256 -> r1.257)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/equalfuncs.c.diff?r1=1.256&r2=1.257)
    pgsql/src/backend/parser:
        gram.y (r2.514 -> r2.515)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/gram.y.diff?r1=2.514&r2=2.515)
    pgsql/src/backend/tcop:
        utility.c (r1.247 -> r1.248)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/utility.c.diff?r1=1.247&r2=1.248)
    pgsql/src/include/commands:
        dbcommands.h (r1.42 -> r1.43)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/commands/dbcommands.h.diff?r1=1.42&r2=1.43)
    pgsql/src/include/nodes:
        parsenodes.h (r1.294 -> r1.295)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/parsenodes.h.diff?r1=1.294&r2=1.295)