[kronolith] Default external calendar

[Martin Hochreiter]

> You cannot simply replace strings in the value copied from the 
> database, because it is a serialized hash. Using $registry in 
> prefs.local.php is not a good idea either.
> Instead you should create a preference hook that builds the hash, and 
> return it serialized.
>
what a pitty :)  ... ok, thank you I will create a hook for that (new 
world for me...)
What should I use instead of the $registry variable to get the 
credentials - or is it ok
to use it in the hooks?

regards
Martin