(svn r7335) -Codechange: redraw station tiles when cargo is moved, for newstations

(svn r7334) -Revert accidentally committed file in r7333

(svn r7333) -Codechange: [win32] Extend the OTTD2FS and FS2OTTD functions to also accept conversions
into a predefined buffer insted of using the static (global) buffer. This is useful if
the converted value will be used later on; no need to copy it somewhere else to save it.
-CodeChange: [win32] Added appropiate macros WIDE_TO_MB_BUFFER, MB_TO_WIDE_BUFFER next to
existing WIDE_TO_MB and MB_TO_WIDE that only do work when UNICODE is defined, saves
#ifdefs all over the place

(svn r7332) -Fix: segmentation fault, discovered by ln-, in the SDL video driver when one goes to fullscreen and there are no suitable resolutions.

(svn r7331) - Codechange: Rename all memory pool macro's and types to "old pool", so the new pool implementation can be committed alongside it.
- Codechange: Rename pool.[ch] to oldpool.[ch].

(svn r7330) -Fix (r7304): Data invalidation doesn't always happen as the local
player, resulting in an empty vehicle purchase list. Specify the player
as an argument to IsEngineBuildable()

(svn r7329) -Fix (r7157): Invalid viewport position on quick zoom

(svn r7328) -Fix: memory corruption. The 'Load Heightmap' window does not have TerraGenesis configuration buttons and it does have only 29 widgets, not at least 33. Thanks to Tefad for finding this bug.

(svn r7327) -Fix: [YAPF] missing YAPF cache notification when building road on rail (new crossing) or removing road from crossing

(svn r7326) -Feature: Add support for gradual (un)loading of vehicles (Maedhros)