[OSD] Improve drainage class parsing

[brownag]

Incremental fixes:

• Generalize drainage class pattern: current "first" matching misses a lot of cases with the word "drained" twice (n=604 series affected; previously single class became multi class)
• Order (excessively -> very poorly) and interpolate between series ranges that span two or more classes (n=1306 series)
• Fix parsing of subaqueous drainage class (n=69 series)
• Fix parsing of hyphenated drainage class (n=792 series)
• Fix list-style Drainage and Permeability sections (i.e. "Drainage: well" or Drainage class: somewhat poorly) (n=269 series)