v0.5.2: multiple small improvements

This release accumulates improvements over the past two weeks:

Better CIFs and better output names, bugfix for multiple ligands, lower memory consumption by default, arbitrary number of diffusion samples;

What's Changed

• CLI command to merge a3ms in a directory by @wukevin in #229
• low-memory regime by @arogozhnikov in #172
• Rewrite CIF saving logic by @arogozhnikov in #233
• Handle covalent bond leaving atoms by @wukevin in #234
• SMILES naming fix and associated tests by @wukevin in #236
• Covalent ligand example + bugfix by @wukevin in #244
• Fix cif writing logic for multiple ligands by @wukevin in #247
• Fix colliding ligand entity IDs by @wukevin in #249
• auto-detect same entity for non-ligands by @arogozhnikov in #251
• arbitrary num_diffn_samples + use ds to enumerate diffusion samples by @arogozhnikov in #260
• Update asym chain names to be A, B, C, D, ... by @wukevin in #262

Minor:

• Bump version to 0.5.1 by @jackdent in #223
• Bump version 0.5.1 > 0.5.2 by @wukevin in #243
• reorder commands to have hatch while checking for version by @arogozhnikov in #263
• check version before deployment by @arogozhnikov in #256
• • fix typo by @arogozhnikov in #230

Full Changelog: v0.5.1...v0.5.2