Update cheatsheets

linux/obabel

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# obabel
+
+> Translate chemistry-related data.
+> More information: <https://openbabel.org/wiki/Main_Page>.
+
+- Convert a .mol file to XYZ coordinates:
+
+`obabel {{path/to/file.mol}} -O {{path/to/output_file.xyz}}`
+
+- Convert a SMILES string to a 500x500 picture:
+
+`obabel -:"{{SMILES}} -O {{path/to/output_file.png}} -xp 500`
+
+- Convert a file of SMILES string to separate 3D .mol files:
+
+`obabel {{path/to/file.smi}} -O {{path/to/output_file.mol}} --gen3D -m`
+
+- Render multiple inputs into one picture:
+
+`obabel {{path/to/file1 path/to/file2 ...}} -O {{path/to/output_file.png}}`