pgsql: thread-safety Apply full patch to enable thread-safety by

Log Message:
-----------
thread-safety

Apply full patch to enable thread-safety by default, e.g. doc changes.

Modified Files:
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    pgsql:
        configure (r1.660 -> r1.661)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.660&r2=1.661)
        configure.in (r1.614 -> r1.615)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.614&r2=1.615)
    pgsql/doc/src/sgml:
        ecpg.sgml (r1.92 -> r1.93)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ecpg.sgml?r1=1.92&r2=1.93)
        installation.sgml (r1.327 -> r1.328)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml?r1=1.327&r2=1.328)
        libpq.sgml (r1.291 -> r1.292)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml?r1=1.291&r2=1.292)
    pgsql/src/test/thread:
        README (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/thread/README?r1=1.2&r2=1.3)