CHANGE: Make the forcing of station coverage for factories to be at least 3 limited to saved games with the current, not next version.
CODE: Add debug messages for each modal dialogue for debugging purposes.
CODE: Downgrade the debug level of "duplicate hash", as this is not necessarily an error.
FIX: Compile error from previous commit.
FIX: Rounding error lead to crashes on a new month in some cases.
Merge commit 'dce5fb9e0e' (Fixes from James's 11.x branch) into emergency-depot-bugfix
Fix the divide by zero error previously fixed by commit dc35fb9, but fix it better.