* Make PostgreSQL helpers "res_dont_care" and "res_must_succeed"
accept PGRES_TUPLES_OK as a sucessful result as well as
PGRES_COMMAND_OK.
* Add new pg_result suboption -tupleArrayWithoutNulls. It works like
-tupleArray except if a field is null, it unsets the field from
the array.
* Add "escape_bytea" and "unescape_bytea" to the methods that can be
invoked from $conn.
* Extend pg_escape_bytea to allow a connection handle to be specified.
If specified, libpq's PQescapeByteaConn is used rather than
deprecated PQescapeBytea, which can return incorrect results since
it can't determine whether standard-conforming strings are enabled.
If the "$conn escape_bytea ..." method is used, the connection-handle
version is automatically used.
* Detect if lo_truncate is available in libpq or not and, if not, return
an error if it is attempted.
* Add support for the lo_truncate function that truncates a large object
to a given length.
* Version bump to 1.7.
* Update autoconf build to Tcl Extension Architecture (TEA) 3.6
* Extend pg_quote to allow a connection handle to be specified.
If the connection handle is specified and the string matches the
null string, returns "NULL" (without quotes). If not, returns
the string quoted for inclusion in SQL commands.
* pg_quote can be invoked as a method of the connection handle
as well. For instance, "$db quote $string".
* Removed unused variables and silence compiler warnings with casting.
* Added "internal_position" and "internal_query" to the error options.
* Added support for async connections. Note that you will have to
use [after] command to find the result of the connection. Callbacks
won't work, since the sock isn't established yet
* added additional sub commands to dbinfo (version, protocol, param,
backendpid, socket)
* Updated autoconf build to Tcl Extension Architecture (TEA) 3.5
* changed the commands that handle params, such that if a value is NULL
then the lib will change the paramValues value to '\0' so that
the backend will insert a NULL correctly
