[sugar] 8.1.1 bugfix release and sugar

[Tomeu Vizoso]

Hi,

I'm going to work on rpms for sugar based on the ones in 703 but whith
the following changes:

- Emit palette popup only after the window is mapped. This fixes
ticket #3486. (Benjamin Berg)

- Fix #3611 and parts of #4084 by setting the palette to be a
transient window of the actiity. (Benjamin Berg)

- In spread layout always get width/height request to not confuse
hippo. Eventually we will have to deal with size changes in a better
way. Fix flakes count in SnowflakeLayout. Fix #5904 (Marco Pesenti
Gritti)

Anything else?

Thanks,

Tomeu