Alpha 5 patch 9 hotfix 25

Alpha 6 is so big, its features are spilling into hotfixes. I think it makes sense to polish out some of the less exciting features with the community before Alpha 6 arrives and brings new players.

[h3]Added/changed:[/h3]

• Building categories are now separating food and non-food production
  
  
  
  
• Added the trade limits window, which allows more control of what stays in town and what goes for export
  
  
  
  
• Added a help page about trade limits
  
  

[h3]Fixed:[/h3]

• Crash on save in some cases
  
• Could put graves too close to water leading to navigation problems
  
• People could forget about their dead relatives graves after loading a save