Use partial instead of anonymous function

cc @r00k
Rename dumb-next-path to deterministic-next-paths

cc @r00k
Rename next-paths to possible-paths

cc @r00k
Place each key/value pair on its own line

cc @r00k
Default update-channel to small dropping-buffer

A dropping buffer of size 1 is the smallest we can use.

cc @r00k