(svn r7711) -Fix (r7354): NewGRF Action 7, GRF check condition 10 didn't ignore unknown GRF IDs. Also separate GRF ID conditions
from parameter conditions to remove code duplication in GRF checking code.

(svn r7636) -Cleanup: Remove unused window classes (sorry WC-mess) and use sizeof(array) instead
of X * sizeof(array[0])

(svn r7616) -Cleanup:
-(re)set _rename_[id/what] to -1 to catch invalid calls (main_gui.c)
-Only invalidate widget of pause/ff instead of whole window (main_gui.c)
-Remove numbering from WE_ and WC_ as it's not needed, also remove
non-existing windowclasses (window.h, openttd.h)
-Give names to some of the enums (window.h)
-In UninitWindowSystem not only free malloc'd widgets, but also reset the z-array (window.c)
-Some coding style, comments, etc.

(svn r7565) -Codechange: Rework DEBUG functionality. Look for appropiate debugging levels to
use in debug.h. grfmsg() is now used as a specific debug-function for grf.

(svn r7564) -Codechange: Some newgrf changes. FFIR/EVAW endian-swapping, functionalize
check_length, don't print copyright message for grfinfo (it is shown in newgrf
window), have action 0x0B print out the messages with severity 0.

(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 r6289) -Fix(r6108) : case 0x48 (generic text) should not have been set over newstations.
It grabbed everyting. Instead, we are now using ids for that purpose, 0xC9, oxD0, 0xDC (FS#304 by Osai)
- Protect newgrf text from entries of 1 char and fewer
- Protect currency name from an overrun of ids
Thanks to glx

(svn r6131) -Codechange : Complete all missing _ttdpatch_flags entries
-Feature : both unifiedmaglevmode are now set.
Maglev and monorail are not allowed to run on each other tracks and will not be.
Setting those flags will allow grfsets as the Norvegian one to be loaded
-Codechange : link the TTDPatch's irregularstations with OTTD's nonuniform_stations
-Codechange : Reformat the whole array (thanks Rubidium, it sure looks better now)

(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 r5975) -Cleanup: use ORIGINAL_BASE_YEAR & ORIGINAL_MAX_YEAR where the functions really depend on the original date format.
-Cleanup: use DAYS_TILL_ORIGINAL_BASE_YEAR where the date variables are in the old date format and conversions are needed.
-Cleanup: replace one (forgotten) instance of uint16 with Date.

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

(svn r4928) CodeChange : Rename functions referring to "Vehicle" for "Feature".
Mainly because newgrf deals with more than just vehicles.

(svn r4816) - NewGRF: action 7/9 improvements:
- split of parameter retrieving to separate function,
- handle param size for grf parameters,
- add more grfid (param 0x88) tests.