separate RP and HILIC systems.

[stanstrup]

column type:

• RP
• HILIC
• Ion-exchange liquid chromatography (IELC)
• ion-pairing liquid chromatography (IPLC)
  
  

Mobile phase pH:

• acidic
• alkaline
• neutral
  
  

Mobile phase additive:

• Trifluoroacetic acid
• Formic acid
• Acetic acid
• Propionic acid
• Citrate
• Ammonium formate
• Ammonium acetate
• Ammonium bicarbonate
• Ammonium hydroxide
• Triethylamine

Also add stats matrix showing how many of each exist in the database: column type vs. additive.

[stanstrup]

Fix with commit 7e828ee43246a6dee9d8a3e350e13b9a6d390a8c. closes the ticket.