Require rdkit and default canonicalize in `buy` (#36)

Reduced printing on load (#34)

Nested catalogs (#28)

Updated links (#27)

This pull request updates several components by adjusting process configurations and updating external resource links for Zinc20 and SureChembl while also bumping the package version.

    Update in tool/canonicalize.py to delete the original file post-canonicalization and modify the parallel process count.
    Changes in tests/test_molbloom.py to adjust the usage of the canonicalize flag and tighten test assertions.
    URL updates in molbloom/init.py and version bump in molbloom/version.py.

Fixed canonicalization bugs in zinc-mini and zinc-instock(#26)

* Various fixes for getting ready to canonicalize

* Fixed the issues

* Fixed bug in script read

Added more gases (#25)

* Added more gases to molbloom

* bumped version

First check for simple reagents, before going to catalog (#24)

Update version.py

Update version.py

Bug fix in allocation memory for non-multiple of 8 sizes (#11)

Co-authored-by: Jorge Medina <jorgemedina@Jorges-MacBook-Pro.local>