pgstatsinfo - pg_statsinfo: * Fix retrieving PostgreSQL version info

Log Message:
-----------
* Fix retrieving PostgreSQL version info from monitored DBs.
  - Previously, pg_statsinfo stored the "built enviroment PostgreSQL vresion".
    Therefore, a wrong version info stored in the repository DB if pg_statsinfo
    was installed by rpm files.
* Fix some small comment typos in pg_statsrepo_alert.sql.
  - This change has no affects to users.

Modified Files:
--------------
    pg_statsinfo/bin:
        pg_statsinfo.c (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.c?r1=1.15&r2=1.16)
        pg_statsinfo.h (r1.15 -> r1.16)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsinfo.h?r1=1.15&r2=1.16)
        pg_statsrepo_alert.sql (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/pg_statsrepo_alert.sql?r1=1.1&r2=1.2)
        writer.c (r1.16 -> r1.17)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/bin/writer.c?r1=1.16&r2=1.17)
    pg_statsinfo/lib:
        libstatsinfo.c (r1.21 -> r1.22)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatsinfo/pg_statsinfo/lib/libstatsinfo.c?r1=1.21&r2=1.22)