(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 r11981) -Fix [FS#1698]: Use unicode glyph mapping to fix up missing/shuffled sprites in original data files instead of shuffling or skipping
sprites directly. Some required glyphs were not loaded.
-Fix: Large capital U with grave (Ù) along with some other glyphs are broken in the original data files, so do no display them.

(svn r11695) -Codechange: Converted the md5 algorithm to OOP
-Codechange: Adapt the md5 algorithm to the OpenTTD source

(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 r11119) -Codechange: analyze .tar files upon loading, remembering their files and offsets, which speeds up .tar handling with a big factor
-Fix: several win32 .tar support problems
-Fix: better checking of .tar versions and other minor things
-Codechange: don't call fclose() but FioFClose to close a file

(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.