Decrease setup time for debian and yunohost

Debian and yunohost packages intend to provide ease of use. The setup time can be decreased using some techniques:

• use precompiled binary from debian package in yunohost instead of compiling duniter which can be extremely long on user machines
• make sure that the binaries are available for arm architectures (raspberry pi)
• use warp or fast sync instead of full sync
• setup a config wizard with smart default (e.g. use username and hostname for node name as default)