v2.1.4

New Features

• Add Notebook/NbCell session methods, CellRow snapshots, summary_nb/find_cells, cell_ast_replace; rename find→find_cells and view→view_cell (#862)
• Add fastcore.editskill module documenting shared editing conventions and re-exporting tools + nbio; switch pyskills entry point to it (#861)
• Add metadata directives as XML attrs in cell2xml (#860)