Reduce stacksize to 32k.

Fix previous change to not madly leak memory.

activity.

Consequent Constification

with allocating its own objcores.

When WRW is used to send stuff to the backend 'req->t_resp' is not
an appropriate base for the timeouts.

We now have:
	VSL() -> send directly to global VSL buffer
	VSLb() -> send to buffered VSL
	VSLbt() -> send txt to buffered VSL

Fixes #1056

the "real streaming" code we are working on.