New XML HTG V2 for reader and writer
This new format squashes together every arrays which used to be split by tree. They can still be read by tree, given some new meta information on the structure of the htg. One can still load an htg with a depth delimiter. Squashing the information saves a lot of space in the file. Prior to that, one XML element was created per tree, which made outrageous large files on htg with millions of trees.
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