Log Message:
-----------
Make the minimum allowed value of work_mem be 64KB always, rather than having
it vary with BLCKSZ as before.  This agrees with what the documentation says,
and avoids a regression test problem when BLCKSZ is larger than default.
Per recent discussion.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        config.sgml (r1.175 -> r1.176)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/config.sgml?r1=1.175&r2=1.176)
    pgsql/src/backend/utils/misc:
        guc.c (r1.449 -> r1.450)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/guc.c?r1=1.449&r2=1.450)

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