I've changed the way slots work. Now instead of buffering and storing
X[HT]ML output, slots store only callback function that generates the
markup on demand. It should be beneficial in case where slot is used
for main content of the page.
There are many side-effects of this, e.g. code of unused slots isn't
executed. Execution order has changed. Give it a go, tell me if it
causes any trouble.
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