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CHTML version 2.0 release notes, 2021-01-09
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The following changes were made compared to the previous version:

- Changes due to changes in Chunks and Tasks 2.0, leaving handling of
  children to the Chunks and Tasks runtime.

- A new hierarchical block sparse matrix library base on a recursive
  quadtree for leaf matrix representation with CHTML.

- Localized inverse factorization.

- Sparse approximate matrix-matrix multiplication.

- Various optimizations, bugfixes, and code cleanup.