(svn r6485) -NewGRF Feature: Match the order of TTDPatch's currencies with those used in OTTD.
This will not reorder OTTD's currencies, but will make it so that
currencies affected by a grf will be those aimed by the writer.

(svn r6454) -Fix(r6108) : Allow custom currency to display both prefix and suffix
-Codechange : Divide rate of conversion from grf by 1000, to match OTTD internal system

(svn r6108) -NewGRF Feature: Implement currencies replacment via grf file.
All properties can now be modified i.e:
Introduction date for euro conversion
Currency name, decimal separator, currency symbol (before or after amount)
and the rate compared to the base currency, the british pound

(svn r5934) -Cleanup: forgot some conversions to Year and to Date
-Cleanup: use _cur_year instead of _date for some (year based) comparisons
-Cleanup: remove a magic number in favour of another (less) magic number

(svn r2962) - const correctness for all Get* functions and most Draw* functions that don't change their pointer parameters
- change a lot of byte player types to PlayerID
- beautify header files, same "#endif /* filename */" ending