pgsql: Added dynamic cursor names to ecpg.

Log Message:
-----------
Added dynamic cursor names to ecpg. Almost the whole patch was done by
Boszormenyi Zoltan, with only a minor tweak or two from me.

Modified Files:
--------------
pgsql/src/interfaces/ecpg/preproc:
ecpg.addons (r1.8 -> r1.9)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/ecpg.addons?r1=1.8&r2=1.9)
ecpg.trailer (r1.15 -> r1.16)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/ecpg.trailer?r1=1.15&r2=1.16)
ecpg.type (r1.3 -> r1.4)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/ecpg.type?r1=1.3&r2=1.4)
extern.h (r1.75 -> r1.76)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/extern.h?r1=1.75&r2=1.76)
parse.pl (r1.5 -> r1.6)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/parse.pl?r1=1.5&r2=1.6)
variable.c (r1.50 -> r1.51)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/variable.c?r1=1.50&r2=1.51)
pgsql/src/interfaces/ecpg/test:
ecpg_schedule (r1.6 -> r1.7)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/ecpg_schedule?r1=1.6&r2=1.7)
ecpg_schedule_tcp (r1.6 -> r1.7)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/ecpg_schedule_tcp?r1=1.6&r2=1.7)
pgsql/src/interfaces/ecpg/test/preproc:
Makefile (r1.5 -> r1.6)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/test/preproc/Makefile?r1=1.5&r2=1.6)