light: add info symlinks
light: show connection info
copy: add timestamp of last advance
light: show new {fetch,sync} info
marsadm: path correction
light: allow limiting the sync parallelism
marsadm: implement new 'view' command
xxx marsadm
infra: fix readlink() for very long paths
infra: remove buggy d_{name,path}len

In rare cases, this could lead to buffer overflows.
Replace buggy concept from the prototype phase with more
robust (although slightly less performant) code.
infra: fix removal of stale directories
light: fix string memleak
zzz debug
zzz