Improved Daap support

[dunsens at web.de]

hi,

i have added a config for manually configured daap shares (my one is at a 
different subnet for example).iI have also readded a password dialog, if 
loading of the share fails with "Authentication required." 

http://www.gitorious.org/~duns/amarok/dunss-clone/commits/config-ui-for-daap

Both works for me with my firefly server, but not with rhythmbox exported 
collections. I'll try to fix this as well. for know I would like to know if I 
can push a merge request and I'd like to get some feedback.

for the future it seems to be unclear if daap support should be in services or 
in the collection browser. imo it should be in the collection browser but 
maybe get its config through the services tab. without knowing much about the 
service/collection architecture i'd propose some hybrid of a 
ServiceCollection, which shows up in the collection browser (because that 
unifies the powerful search queries over all dbs), but is configured as a 
service. this logically only makes sense for services which provide a "shared" 
collection.

additionally when exmapping amarok i have found out that loading a 67000 daap 
share takes roughly 50 mib heap space with me. DaapCollection inherits 
MemoryCollection which simply stores everything in memory. i think a 
"TemporaryCollection" which uses the always available mysql (either mysqle or 
the server) as its db and creates temporary tables there to avoid loading 
everything in ram would make sense, but i am not in mysql dev. (rhythmbox btw 
also stores everything in memory and seems to scale even worse).

cheers,
duns
-- 
My blog: http://whilos.blogsite.org

No brain - no headache!