Add a new Saltpetre recipe because industrial amounts are unpleasant to make

[ohjoy]

tl;dr: Add a new Saltpetre recipe like `(1) Nitrogen + (1) Compost + (1) Potash -> (3) Saltpetre` or something else that can be made in Botany to meet the needs of Botanists.

SITUATION:
This post was originally going to be a subsection of another post about potato batteries and potato cells, but I realized that for full Botany crews, Saltpetre is difficult enough to obtain that it warranted its own post.

There are three ways of obtaining Saltpetre:

1. Use 2010 Vintage.
   
2. Order some from Cargo.
   
3. Make urine yourself.
   

All of these are inadequate for making very large (5,000u to 10,000u) amounts of Saltpetre (necessary when trying to maximize plant stats, even more so with a full crew):

1. Use 2010 Vintage: Uncommon and difficult to obtain in large quantities.
   
2. Order some from Cargo: Acceptable for lesser amounts of Saltpetre. Cargo can reach 1,000u with 5 Medical/Hydroponics Vending Machine Restocking Packs (1000u / (40u per bottle * 5 bottles per restock * 1 restock per crate) = 5 crates) but expecting them to reach 10,000u with 50 crates is cruel and unusual. Potash does not count for reasons I will elaborate upon below.
   
3. Make urine yourself: Unviable, and also why Potash is not counted above. You need to drink 10 times to produce 4u of urine, which only produces 12u of Saltpetre. You can obviously drink less than 10u per gulp, but to produce urine with any amount of speed (by taking advantage of chugging) you will need to drink 10u per gulp. This means you need to drink 100u to produce 4u of urine.
   • Urine has a chems consumed to chems produced ratio 25:1, one of if not the worst out of any in the game. 
     
   • Producing urine is very slow, at 4u per 10+ seconds.
     
   • Drinking plain water will make you rapidly hit the 330u cap, at which point drinking to produce urine becomes infeasible. You could splice several fruits for their juices and grow some Venne, but this will only delay reaching the cap, not prevent it, at which point urine production slows to a crawl.
     

SUGGESTIONS:

• Add another recipe for Saltpetre that can be made in Botany, perhaps by substituting Urine for something else. Plain Nitrogen would be fine, since we can make that with Beans and it's not horrifically far off from how Saltpetre is actually made.
  
• Add a Pee plant as a mutation of the Pea plant.
  
• Make any of the following chems diuretics: Ethanol, Water, Sugar, Mannitol, Coffee.
  Visit here for more information: https://en.wikipedia.org/wiki/Diuretic#M..._of_action
  Diuretics can have one or more of the following properties:
  • Increase urine each life cycle.
    
  • Increase urine when consumed.
    
  • Increase urine gained from other chems when comsuming them.
    
  • Increase urine produced when peeing.
    
  • etc.
    
  Preferably enabling me to constantly `*piss` without waiting.
  

I understand there have been issues with "serial pissflooders" in the past, so I imagine the first suggestion is most preferable.