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* Objectives:
* New Aesara objectve (623, 629, 635)
* Sampling:
* New Emcee sampler (606)
* Fix compatibility to new Theano version (650)
* Storage:
* Improve hdf5 storage documentation (612)
* Hdf5 history for MultiProcessEngine (650)
* Minor fixes (637, 638, 645, 649)
* Visualization:
* Fix bounds of parameter plots (601)
* Fix waterfall plots with multiple results (611)
* CI:
* Move CI tests on GitHub Actions to python 3.9 (598)
* Add issue template (604)
* Update BionetGen Link (630)
* Introduce project.toml (634)
* General:
* Introduce progress bar for optimization, profiles and ensembles (641)
* Extend gradient checking functionality (644)
* Minor fixes:
* Fix installation of ipopt (599)
* Fix Zenodo link (601)
* Fix duplicates in documentation (603)
* Fix least squares optimizers (617 631 632)
* Fix trust region options (616)
* Fix slicing for new AMICI release (621)
* Refactor and document latin hypercube sampling (647)
* Fix missing SBML name in PEtab import (648)