[horde] Registry and prefs without effect

[NP HordeML]

Hi,

I've been using Horde5 for years without issue, especially the Ingo 
component which works extremely well! My installation only have Horde, 
Ingo and IMP. IMP is "hidden" as I don't want a WebMail but it allows 
Ingo to list the user folders in the "Deliver to..." feature of the 
filtering process.

I'm trying to migrate to Horde6 with a brand new install. Once the 
corresponding settings from Horde5 are adapted to Horde6, most of it 
works and I really like that providing the "old" SQLite file upgrades it 
with the new specifics without losing the data.

I use a combination of both "local" prefs as well as "vhost" style 
configuration files. The same Horde5 installation serves 3 domains and 
everything works perfectly.

But, on Horde6, I'm facing a few issues I can't figure out, here they are.

1. File HORDE/var/config/ingo/prefs.local.php
```
$_prefs['forward']['locked'] = true;
$_prefs['redirect']['locked'] = true;
$_prefs['redirectkeep']['locked'] = true;
$_prefs['spam']['locked'] = true;
```

But there's no effect on the UI, all of these sections still appear and 
are functional.

SIDE NOTE: It's a bit weird that I had to write a hook since Horde5 to 
make Ingo login to the Sieve service using the full username (including 
domain) and I still need that hook in Horde6. IMP have "hordeauth = 
full" which would be nice to have in Ingo to avoid using a hook :-)


2. I try to hide IMP from Horde6's menu but I can't make it work

In Horde5, simply setting "$this->applications['imp']['status'] = 
'hidden';" in "registry.local.php" (or registry-SERVERNAME.php) worked 
perfectly.

In Horde6, the behaviour is weird.

- If I'm already logged in, modifying "registry.local.php" and 
refreshing the browser does change anything

- If I'm not logged in (or log out first), trying to log in spits a big 
exception complaining that the registry configuration misses required keys.

If some Horde guru have some clues, that would be nice :-)

-- 
Neil