[squeakland] Number lines rotation center at zero point

[Ricardo Moran]

Hi,

As requested by Steve I made a small change in the number lines to put the
rotation center at zero point (unless the user has defined a specific
point, in which case the user's choice will be honored).

I don't know if this qualifies for inclusion now that we are in "feature
freeze" mode, but unlike the "transform" tiles I propose the other day,
this one is a very small change (and it looks pretty clean to me). So, I'm
sending it as a change set and if you feel it's safe to include it please
do.

Cheers,
Richo
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