release status update

[David Revoy]

> Is there anything else I forgot about the release?
I think this bug is reported ; but when selecting a brush preset , the 
preview picture don't update in the area where we can paint the brush 
apparence.
It's make difficult updating already done brush preset.

Also another minor thing is also the icon of 'multibrush' tool ; similar 
to the single brush tool.

As far as I tested, everything else is ready :D
All sound good !
Congratz to the developers  :)