* PEERINFO: [CG]
- trust: need *fast* way to check/update trust in peers
(async peerinfo would not be right; certainly not with the current API)
-* TRANSPORT: [CG]
- - need to implement and test new blacklisting code (server-side only, client API exists)
* TOPOLOGY: [CG]
- - needs more testing (especially F2F topology) -- need transport blacklisting to be implemented first!
+ - needs more testing (especially F2F topology) & transport blacklisting
* FS: [CG]
- support recursive download even if filename is NULL and we hence
do not generate files on disk (use temp_filename)