(svn r14200) -Fix (r14199): some OSes failed to compile. Furthermore I hate wrong comments!

(svn r14199) -Codechange: split fileio.h into fileio_type.h and fileio_func.h so not everything that includes saveload.h needs to include everything else too.

(svn r14198) -Codechange: [NewGRF] Simplify handling of common vehicle properties.

(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 r14196) -Codechange: make the searching for files with a specific extension extendable.

(svn r14194) -Fix: don't use hardcoded character offsets to get hg revision. This make it similar to svn and git (ie without the ':').

(svn r14193) -Fix (r14191): don't put an unsigned 0x80 in a signed int8 as that's not what you want.

(svn r14192) -Fix [FS#2236]: properly update the current timetable's travel/wait times instead of only doing it for one vehicle in the shared order chain and only when some bit has not been set (PhilSophus)

(svn r14191) -Codechange: unify the code to skip sprite payload (i.e. not the header).
-Fix: sprite payload skipping wouldn't skip enough bytes in a very small subset of compressed sprites.

(svn r14190) -Codechange: use alloc instead of malloc+free when the allocated memory shouldn't be used after the function ended.