Applied Zoltan's patch to fix a few memleaks in ecpg's pgtypeslib.

src/interfaces/ecpg/pgtypeslib/numeric.c

src/interfaces/ecpg/test/compat_informix/dec_test.pgc

src/interfaces/ecpg/test/expected/compat_informix-dec_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test.stderr

src/interfaces/ecpg/test/expected/pgtypeslib-dt_test2.c

src/interfaces/ecpg/test/expected/pgtypeslib-nan_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-nan_test.stderr

src/interfaces/ecpg/test/expected/pgtypeslib-num_test.c

src/interfaces/ecpg/test/expected/pgtypeslib-num_test.stderr

src/interfaces/ecpg/test/expected/pgtypeslib-num_test2.c

src/interfaces/ecpg/test/expected/sql-array.c

src/interfaces/ecpg/test/pgtypeslib/dt_test.pgc

src/interfaces/ecpg/test/pgtypeslib/dt_test2.pgc

src/interfaces/ecpg/test/pgtypeslib/nan_test.pgc

src/interfaces/ecpg/test/pgtypeslib/num_test.pgc

src/interfaces/ecpg/test/pgtypeslib/num_test2.pgc

src/interfaces/ecpg/test/sql/array.pgc