Build: Fixed warning about setjmp clobbering yyerrstatus.
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.
Stricter types.