(svn r14197) -Codechange: rework (original) base graphics determination methods. This yields in the following:
-Feature: make configuring the to-be-used base graphics via openttd.cfg and the command line possible.
-Feature: allow both the German as well as non-German toyland graphics as "correct" and official graphics.
-Feature: allow people to create their own base graphics easily and without requiring code changes.

(svn r11457) -Fix: (r11455) Reenable the accidentaly removed one way roads option
-Change: Enable one way roads like the remove via a toolbar icon

(svn r11433) -Fix: starting OpenTTD with DOS files made it look weird out of the box.
-Change: make extra sprites (the ones not in the TTD GRFs) replaceable using Action 5.
-Feature: make replacing contiguous subsets of sprites in for some types possible in Action 5.
Note to GRF authors: when you replaced OpenTTD sprites that are not from the TTD GRF files using Action A, your GRF will not have the intended result anymore as the sprite numbers have changed. You should replace the Action A with an Action 5 from now on.

(svn r8838) -Feature: Show newgrf error messages loaded in Action B in the newgrf gui
window. GRFs with an error have a warning symbol shown before the name.

(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make.
- Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
- A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
- Proper support for OSX universal binaries.
- Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
- Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.