Optimize page loading, 8: Delay SVG.$initPostSvg
Optimize page loading, 8: Delay SVG.$initPostSvg

Delay SVG.$initPostSvg until a little while before SVG is drawn — it
takes rather long.

Also:
- Rewrite the init step exexcution code (I had scheduled all steps for
  execution at the very same time), delay each step 100 ms not 1000 ms.
- Call $initPostsThreadStep3 from $initPostsThread (I forgot until now)
- Split $initPost into $initPostStep1 $initPostStep2
- Split $initPostsThreadStep3 into steps 3 and 4

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