Fixes chemscan

code/modules/reagents/chemistry/fermi/readme.md

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+How to code fermichem reactions:
+First off, probably read though the readme for standard reagent mechanisms, this builds on top of that.
+
+#bitflags
+for `datum/reagent/` you have the following options with `var/chemical_flags`:
+
+```
+REAGENT_DEAD_PROCESS		calls on_mob_dead() if present in a dead body
+REAGENT_DONOTSPLIT		    Do not split the chem at all during processing
+REAGENT_ONLYINVERSE		    Only invert chem, no splitting
+REAGENT_ONMOBMERGE		    Call on_mob_life proc when reagents are merging.
+REAGENT_INVISIBLE		    Doesn't appear on handheld health analyzers.
+REAGENT_FORCEONNEW		    Forces a on_new() call without a data overhead
+REAGENT_SNEAKYNAME          When inverted, the inverted chem uses the name of the original chem
+REAGENT_SPLITRETAINVOL      Retains initial volume of chem when splitting
+```
+
+for `datum/chemical_reaction/` under `var/clear_conversion`
+
+```
+REACTION_CLEAR_IMPURE       Convert into impure/pure on reaction completion
+REACTION_CLEAR_INVERSE      Convert into inverse on reaction completion when purity is low enough
+```