[tools] add hybrid node to visualize real robot

using multinode_server (socket, JSON, asyncore)

NOTE: StreamJSON should be extern, but cant import `pymorse` in python2
due to `concurrent` module (python3 only, in `pymorse.future`)
[tools] remove old converter from tree

Those scripts where used to convert MORSE 0.6 scenes to MORSE 1.0
... That's "pre-history" :D
[tools] remove dtm to GeoTiff (use clara)

use https://github.com/pierriko/clara instead
pep8: comparisons with None

Comparisons to singletons like None should always be done with is or is
not, never the equality operators.