Build: Fixed warning about setjmp clobbering yyerrstatus.
Stdio.Buffer: Support offset parameter for add_hstring/read_hstring.
Stdio.Buffer: Support all types for add_hstring.
Sql.pgsql: New and improved full threaded version.

Lower latencies, increased parallelism, theoretical
elimination of all race conditions, simplified code,
uses Stdio.Buffer, no C-helper anymore, less filling.

As a new feature, introduces: send_row(),
fetch_row_array() for increased efficiency,
set_result_callback() and set_result_array_callback()
for event driven database queries.
pgsql: finetuning, cleanup, improved error response behaviour.
pgsql: Further finetuning, fix normal query() race condition, thread safe.

Make the result object threadsafe (e.g. calling fetch_fields() and
fetch_row() simultaneously from multiple threads on the same result
object is supported).
pgsql: Support PostgreSQL 9.4 authentication quirks.
pgsql: Fixed reconnect behaviour, fixed textqueries, eliminated one race.

All issues eliminated.  I will run it in production servers as of now.
pgsql: Missed a spot where a portal could be undefined.
pgsql.resync interface fixed.
pgsql: Support Val.null.
pgsql: Make statusfunctions wait until the connection has been established.

The driver has survived moderate testing in production servers (Roxen),
it is ready for production release.
pgsql: Updated CHANGES.
Stricter types.