(svn r5887) -Cleanup: move date related functions, defines and variables to date.[ch]
-Cleanup: fix whitespace related coding style issues in date.[ch]
-Cleanup: make original comments doxygen compatible and remove/change outdated comments

(svn r5886) -Fix [FS#273]: Incomplete removal of player owned property due to lack of money.

(svn r5883) -Fix [FS#272]: use the height of the edge of the map for shadows of aircrafts that are outside the map; similar to r5841, caused by r5794.

(svn r5874) -Feature [FS#234]: Remember the maximized state and restore on start. This also fixes a bug where a different resolution is chosen for a maximized window, but it retains the maximized flag. Only win32.

(svn r5873) - Fix a bad comment in r5871, and add a further check for saving strings.

(svn r5872) - Feature: Add an icon to the SDL openttd executable.

(svn r5871) -Feature: Add a possibility to handle pointer strings without a buffer from the configuration file. Handy for variables that will never be changed during runtime

(svn r5866) - Forward-port the release-changes from the 0.4 branch back to trunk. This ensures an updated changelog, known-bugs, etc.

(svn r5864) -Feature: Also allow horizontal and vertical rails on steep slopes

(svn r5854) -Fix: [elrails] now electric engines are stopped if they enter a non-electrified depot even if they would have left right away if the depot had catenary
this solves the issue where electric engines in a certain situation could leave non-electrified depots, turn around and enter all the time