Import and rebase zoning patch

Fix some of the whitespace issues

http://www.tt-forums.net/viewtopic.php?p=888801#p888801

src/zoning.h

@@ -0,0 +1,39 @@
+/** @file zoning.h */
+
+#ifndef ZONING_H_
+#define ZONING_H_
+
+#include "openttd.h"
+#include "tile_cmd.h"
+
+enum EvaluationMode {
+	CHECKNOTHING = 0,
+	CHECKOPINION = 1,  ///< Check the local authority's opinion.
+	CHECKBUILD = 2,    ///< Check wither or not the player can build.
+	CHECKSTACATCH = 3, ///< Check catchment area for stations
+	CHECKINDCATCH = 4, ///< Check catchment area for industries
+	CHECKBULCATCH = 5, ///< Check catchment area for buildings
+	CHECKBULUNSER = 6, ///< Check for unserved buildings
+	CHECKINDUNSER = 7, ///< Check for unserved industries
+};
+
+struct Zoning {
+	EvaluationMode inner;
+	EvaluationMode outer;
+	int inner_val;
+	int outer_val;
+};
+
+VARDEF Zoning _zoning;
+
+SpriteID TileZoningSpriteEvaluation(TileIndex tile, Owner owner, EvaluationMode ev_mode);
+
+int TileZoningEvaluation(TileIndex tile, Owner owner, EvaluationMode ev_mode);
+
+void DrawTileZoning(const TileInfo *ti);
+
+void ShowZoningToolbar();
+
+EvaluationMode GetEvaluationModeFromInt(int ev_mode);
+
+#endif /*ZONING_H_*/