psqlodbc - psqlodbc: 1) Fix a bug reported by Milen Manev that SQLExec

Log Message:
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1) Fix a bug reported by Milen Manev that SQLExec *select for a table* -> SQLDescribeCol() -> add a column to the table
->SQLExec *select for the table* -> SQLDescribeCol() for the added column causes a bad result. 
2) Use strncpy_null() instead of strncpy().

Modified Files:
--------------
    psqlodbc:
        connection.c (r1.175 -> r1.176)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/connection.c.diff?r1=1.175&r2=1.176)
        connection.h (r1.89 -> r1.90)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/connection.h.diff?r1=1.89&r2=1.90)
        convert.c (r1.175 -> r1.176)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/convert.c.diff?r1=1.175&r2=1.176)
        dlg_specific.c (r1.83 -> r1.84)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/dlg_specific.c.diff?r1=1.83&r2=1.84)
        dlg_wingui.c (r1.20 -> r1.21)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/dlg_wingui.c.diff?r1=1.20&r2=1.21)
        environ.c (r1.72 -> r1.73)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/environ.c.diff?r1=1.72&r2=1.73)
        info.c (r1.156 -> r1.157)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/info.c.diff?r1=1.156&r2=1.157)
        parse.c (r1.70 -> r1.71)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/parse.c.diff?r1=1.70&r2=1.71)
        pgtypes.c (r1.88 -> r1.89)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/pgtypes.c.diff?r1=1.88&r2=1.89)
        pgtypes.h (r1.36 -> r1.37)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/pgtypes.h.diff?r1=1.36&r2=1.37)
        results.c (r1.112 -> r1.113)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/results.c.diff?r1=1.112&r2=1.113)
        setup.c (r1.45 -> r1.46)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/setup.c.diff?r1=1.45&r2=1.46)
        socket.c (r1.66 -> r1.67)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/socket.c.diff?r1=1.66&r2=1.67)
        statement.c (r1.138 -> r1.139)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/statement.c.diff?r1=1.138&r2=1.139)
        version.h (r1.128 -> r1.129)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/psqlodbc/psqlodbc/version.h.diff?r1=1.128&r2=1.129)