Another svg.py update - <flow space optimization

<flow.. elements extraction space optimization - making it closer to behaviour of Inkscape

This removes a bunch of unwanted spaces in transcripts (mostly in sound effects)
(This is just a part of them, most of them are inside <text>)

All changes were checked and in doubt checked against the comic.
(I had a working version, and after checking it, I found a rare bug, so I had to fix it and check it again. A lot of checking, eh?)

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And is there a reason why the website hasn't been updated according to the repository?
E.g. no Asturian translation, no P&C mini buttons.