(svn r7138) -Fix: [vehicle list windows] fixed a rare crash where having some (not all) vehicle list windows open for a player, that goes bankrupt would crash the game
-Codechange: closing all windows for a player will now loop all windows and close those, which got the player as caption instead of having a list of windows to close

(svn r7137) -Codechange: [win32] Use windows function in main loop to check if we have pressed ALT
(for ALT+TAB) instead of magic global _pressed_key from input-loop. (KUDr)

(svn r7134) - Fix (r7133) Still can't build oil refinery in the desert climate (this time i tested it)

(svn r7133) - Fix: Can't build oil refinery in other climates than temperate.

(svn r7131) -Fix (r7126) which fixes (r2817) the activating of a function call that was
1. never executed before that and even if it would, it
2. could never be executed because if it did OpenTTD would crash

(svn r7130) -Codechange: Handle the positioning of windows through the desc->left/top settings with
some special values (WDP_) instead of checking window-class. This also fixes FS#172
now that we can position windows arbitrarily and are not restricted to window-classes.

(svn r7129) -Codechange: Get rid of a global variable that only sets a window's number.

(svn r7128) -Codechange: Replace magic numbers by magic enums (windowdesc positioning WDP_AUTO = -1)

(svn r7127) -Codechange [FS#149]: Improve the usability of the signal-dragger, do not bail out
at (certain) errors, just silently ignore them.

(svn r7126) -Synchronize the engine-renew settings of a player when joining a multiplayer game.