Patch for crash on closing

[Sven Langkamp]

Hi,

after my patch from yesterday all KOffice apps are now crashing on closing.
The problem is that the registry deletes the colospaces in the destructor
and the colorspace use the registry to get the cache.
The patch change the behavior so that colorspaces owned by the registry
don't delete the cached conversion themself. Instead this is done with the
destruction of the cache.

Can you have a look at it?



Sven
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