re-design of new account assistant

Hello,

Now that we depend on GTK 2.10 we can move to GtkAssistant instead of
GnomeDruid. I propose here to think about a re-design of the assistant
with Telepathy in mind.

With the rework of GossipAccount proposed [1] we will have an unknown
number of parameters to config. All those parameters shouldn't always be
displayed to the user. So what I suggested to Eitan for the TELEPATHY
branch is having one GtkAssistant page for each known protocol to
display only useful information with a nice UI specialised for this
protocol (MSN, jabber, IRC, whatever is possible with telepathy). If the
protocol is unknown (Gossip should work with unknown protocols available
for free thanks to telepathy) we can make a special page which displays
all parameters available but sorted with the GOSSIP_ACCOUNT_PARAM_FLAG
to hide optional parameters. So the first page of the assistant should
ask for the protocol and next pages should depend on the user's choice.

Like that we'll have one page for each known protocol (plus one for
unknown). This means we should create one GtkWidget for each, containing
all we need to display to the user. This GtkWidget can be append to the
GtkAssistant because gtk_assistant_append_page() takes a GtkWidget as
parameter (that differs from GnomeDruid). It will be then very easy to
reuse this same widget for the accounts_dialog window. This avoid
current code duplication between the GnomeDruid pages and
accounts_dialog.

I think all this can be implemented in HEAD even if we have only one
protocol (and none unknown) because with GossipAccount's rework it's
possible to implement all that in HEAD and would facilitate the
migration to telepathy in the future.

Of course this is only suggestions waiting for comments.

Thanks,
Xavier.

[1] http://bugzilla.gnome.org/show_bug.cgi?id=355797

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