Add auto labelling button and check database

[lpatiny]

we would need to add 2 new options in:

• Auto label atoms

will call molecule.autoLabel() and update the molfile in the state (requires new version of openchemlib-utils)

• Display auto-labelling database

will display a modal dialog as a grid with the content of the autoLabelDatabase. Chemical structure as 300x200 with the label center bold on the top and mf (using react-mf) + mw (2 decimals) in the center bottom