(svn r5136) Fix various style bugs:
- Trailing whitespace
- Trailing empty lines
- Missing newline at EOF
- Missing svn:eol-style native

(svn r1453) Feature: MD5 hash check for TTD files
The original TTD files are now checked with a MD5 sum to determine which version of the grf files is used and to warn about possible file corruptions. (Thanks to ledow for the original patch)

(svn r1038) Feature: OpenTTD runs with the grf files of the DOS version
Please read the Readme for further information. There are some minor graphical glitches when you use the DOS files. E.g. the autorail button is a bit screwed up.