Major changes:
- Update to current fplll API (Martin Albrecht)
- Support for gathering multiple solutions from enumeration (Guillaume Bonnoron, Léo Ducas)
- Support for BDD/CVP enumeration (Martin Albrecht, Guillaume Bonnoron)
- Canonical base from/to Gram-Schmidt base conversion (Martin Albrecht)
- Multiply left for integer matrices (Martin Albrecht)
- A new tree-based tracer for gathering statistics (Martin Albrecht)
- A simple parallel BKZ (Martin Albrecht)
- Support for arbitrary auxiliary parameters for `BKZ.Param` (Martin Albrecht)
- `install-dependencies.sh` will clone the matching fplll branch if it exists to aid development (Martin Albrecht)