[imp] hordeauth with IMP patch

[Vijay Mahrra]

Hello all,

Excuse me if you've already read this message which I originally posted to the
dev list yesterday, but I wasn't subscribed here, and this is probably a
better post to send my message.

I've patched IMP to support a Gollem-style hordeauth capability.

The reason this was written was to enable the user to select one of several
servers but using the same horde login credentials for authentication, saving
the user from entering their username/password again.

config/servers.php.dist
login.php
redirect.php
templates/login/login.inc

1. In servers.php, there is an extra option in the $servers array 'hordeauth'.
 (I patched the servers.php.dist copied blurb from Gollem to reflect this.)

2. If hordeauth is not empty (thank you for explaining and removing my
fixation on array_key_exists chuck!) a new extra servers list is displayed on
the IMP login page for each server which has hordeauth enabled.  If the list
is empty, no extra 'hordeauth' list is displayed.

3. If a server entry has enabled hordeauth, it is displayed in the standard
list of servers (i did this to avoid confusion between the server lists
having the same entries, so to allow a user to use hordeauth and enter
different login credential requires an extra entry in $servers)

4. If the user uses IMP for horde authentication, I make the select list
display all of the entries from $servers regardless of whether of not they
are set to use hordeauth, and also prevent the hordeauth select list from
being
displayed if no user has been authenticated yet.

I hope this is useful.  I've also attached a screen shot to make it a bit
clear as to what it is I've changed regarding the user interface/login
screen.

Vijay
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Desc: authenticates using server info looked up from
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