Don't wrap with Horde_Url.

It's unnecessary and serializes as a hash in the cache.
Sort by date, even on grouped time slices.

We probably should implement a multi-level sorting which takes the currently
selected sort order into account, but for now this keeps the entries from being
in random order.
This is static. And fix timezone alias access.
Catch but log exceptions from invalid events.
Default to SQL storage.
[jan] Fix retrieving value lists from Horde_Session.
Add another proxy method.

Fixes using the optimized timeobject listing in shared sql backends.
Fix formatting of date fields.
Further restrict result set for time objects.