replace ctorrent with aria2c

[HappyBasher]

ctorrent will be replaced with aria2 to to improve performance when distributing Linbo images via torrent. In addition btcheck and buildtorrent are used to manage torrent files.
Every image will get a hash file to store the torrent hash. This makes update checks easier on the client and allows the use of opentracker's torrent whitelist.

[HappyBasher]

aria2c runs with default settings for now. Please give feedback if there is any need to configurate aria2c settings.

[Buster-de]

Hi,

what is the reason for using these particular command-line parameters? Are they the result of testing, or are they based on assumptions about what the parameter names imply, even though their actual behavior may be different?

• --enable-dht=false
  • this and --bt-enable-lpd true as well a low value for --bt-tracker-interval=<SEC> could help in situations like https://ask.linuxmuster.net/t/netzsegmentierung-und-performanz-bei-der-imageverteilung/12181 where the same images is distributed to firewalled subnets. The tracker might serve a list full of peers from different (not reachable) subnet A to the torrent client in subnet B first. Enabled DHT and LPD might enable the client to find local peers in same subnet B (broadcast domain) in the mean time, till the torrent clients asks the tracker for an updated peer list.
• --disable-ipv6=true
  • Its 2026, nobody should disable IPv6 unless there are some serious issues left.

Best regards