remove debug output, and cleanup after hierarchy builder

update to Potree 1.8

Merge pull request #458 from potree/compression

Compression

fix argument parsing; allow drag&drop of las files into binary; copy …

…json license to build

update readme

update license

Merge pull request #363 from digimatspa/Fix356

Fixed problem with PTS/XYZ files where the RGB point colour is not co…

Merge pull request #378 from potree/extra_attributes

Extra attributes

new attributes

Merge pull request #306 from potree/develop

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