(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 r5926) -Codechange: make _cur_year contain the full year, instead of the offset since 1920
-Codechange: store all year related variables that are _not_ stored in a savegame/transported over the network in the same format as _cur_year

(svn r5916) -Cleanup: use MIN_YEAR/MAX_YEAR for the year boundaries and BASE_YEAR when comparing _cur_year with a 'full' year.
-Cleanup: replace some magic '1920' values with BASE_YEAR.

(svn r5887) -Cleanup: move date related functions, defines and variables to date.[ch]
-Cleanup: fix whitespace related coding style issues in date.[ch]
-Cleanup: make original comments doxygen compatible and remove/change outdated comments

(svn r5496) -CodeChange: Removed two compiler warnings
- add newline at end of file in currency.c
- remove unused (for now) CargosChangeInfo