(svn r19251) -Codechange: add a contructor to GRFError and use it to allocating errors more uniform.
-Fix: some grf error messages didn't free the previous error messages, creating a memory leak

(svn r13618) -Codechange: move tar-specific declarations to separate file
Removes indirect dependency on <string> and <map> for over 40 files

(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 r11106) -Add: added .tar support; you can pack all files in your data/ dir in how ever many .tar files you like, keeping the dir-structure equal to the unpacked version, and OpenTTD can handle them just like the files were unpacked
-Note: useful for GRF-packs and 32bpp PNGs. Don't forget to keep the dir-structure alive for 32bpp PNGs!
-Note: file-loading-order: search-paths, .tar-files in the order found on disk (can be anything at all, don't depend on it.. use 'openttd -d1' to see which order they are added)

(svn r10182) -Codechange: rewrite most part of the file loading/searching to be more flexible.
-Codechange: add support for personal directories on Windows.
-Fix [FS#153, FS#193, FS#502, FS#816, FS#854]: fix issues related to fixed names, fixed places of files/directories and application bundles.

(svn r10114) -Fix: Only load newgrf error messages if the language matches the current
language. Since only one error can be loaded anyway, if the language didn't
match you'd get "Undefined string". Also since we're only loading one language
there's no need to use AddGRFString any more.

(svn r9561) -Fix (r9561): loading the newgrfs in openttd.cfg was broken.
Note: as the 'full' path is stored of the newgrfs, the newgrfs in the old cfgs are not made default (you have to set them again).

(svn r9560) -Codechange: add support for multiple 'base' directories for newgrf searching.
-Codechange: do not add duplicate files to the newgrf list.

(svn r9031) -Codechange: Introduce grfconfig->status, and use it for states that are
mutually exclusive. At the same time, add an INITIALISED state which makes it
possible to check if a grf is not yet active but will be later on during the
GLS_ACTIVATION loading stage.

(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 r8106) -Feature/Fix: Add the ability to load savegames when you don't have the exact GRF files in your list. GRF files that are found based on GRFID (but not on matching md5sum) are used instead of disabling them. This does not affect MP games, there you still need an exact match.
-GRF Window colour-codes changed a bit: Static is now grey, and compatible GRF (found locally only based on GRFID) are shown in orange. Compatible GRF's also have an orange status/warning text saying they're not the original the game was saved with.
-Loaded games with something amiss regarding GRF's will show an appropiate warning message.

(svn r8105) -Codechange: Change FindGRFConfig so that if md5sum parameter is omitted (or NULL)
only a check for GRFID is done and not on md5sum as well. Remove blanksum in the function as it's obsoleted