* Fix possible segfault in pg_select if you unset the array variable
inside of the code body.
* Update autoconf build to Tcl Extension Architecture (TEA) 3.9
* Add -nodotfields option to pg_select. if set it will inhibit
the creation of the .tupno, .numcols and .headers fields
in pg_select results.
* Added new command, pg_set_single_row_mode aka ::pg::set_single_row_mode
to enable retrieving query results row-by-row.
* Add subcommands for direct execution of connection handles for
conndefaults, set_single_row_mode, is_busy, blocking and
cancel_request.
* Make "make distclean" get rid of more autoconf work product.
* Update README.freebsd.
* Clean up compiler warnings.
* Add new -withoutnulls option to pg_select, if set will remove null
fields from the row result array.