Merge branch 'rnou/rslice' into 'master'

Malleability extension -> mutate (shrink, expand) and random slicing + cutshift capabilities

Malleability extension -> mutate (shrink, expand) and random slicing + cutshift capabilities
Malleability is easy (+ , - markers), daemons xpanding automatically create + line in host file
Malleability tool automatically removes shrink servers
Also GKFS_EXPAND_ON_DEMAND is available --> Chunks are only transferred if clients ask for them (small penalty)

Solves some bugs also.

See merge request !316