[PATCH] Automatic fetching of refcursors

Hi all,

I've created a patch that enables automatic fetching of refcursors from a
function/procedure. Functions/procedures can return one or more refcursors,
and the client application can then consume them the way multiple result
sets are normally consumed via ODBC.

Below is a summary of the attached patches:

0001 (`regress.ps1` changes unrelated to refcursors)
* Allow installation and testing of a debug build of the driver (useful
for debugging)
* Fixed a bug in `regress.ps1` where accepting the default password of
`postgres` did not work

0002
* Added a FetchRefcursors setting
* When FetchRefcursors is enabled, executes some refcursor code in
`statement.c` that already existed but was not compiled in due to
REFCUR_SUPPORT not being #defined

0003
* Enhanced refcursor code to support multiple refcursors
* Fixed an issue where output parameter bindings were not processed when
using refcursors
* Added a `fetch-refcursors` regression test

Notes:
* Client application must execute the statement in a transaction to avoid
cursors being closed prematurely (i.e. turn auto-commit off)
* Works with both ODBC CALL and PostgreSQL CALL syntaxes
* A search through the mailing list archive shows that refcursor support
is a feature that multiple people have wanted

Regards,

Adrian Grucza
Technical Lead
Tel: +61390185800
adrian(dot)grucza(at)iress(dot)com
www.iress.com
Level 16, 385 Bourke Street,
Melbourne, Victoria, 3000
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