(svn r15027) -Merge: tomatos and bananas left to be, here is NoAI for all to see.

NoAI is an API (a framework) to build your own AIs in. See:
   http://wiki.openttd.org/wiki/index.php/AI:Main_Page
 With many thanks to:
  - glx and Rubidium for their syncing, feedback and hard work
  - Yexo for his feedback, patches, and AIs which tested the system very deep
  - Morloth for his feedback and patches
  - TJIP for hosting a challenge which kept NoAI on track
  - All AI authors for testing our AI API, and all other people who helped in one way or another
-Remove: all old AIs and their cheats/hacks

src/ai/api/ai_accounting.cpp

@@ -0,0 +1,26 @@
+/* $Id$ */
+
+/** @file ai_accounting.cpp Implementation of AIAccounting. */
+
+#include "ai_accounting.hpp"
+
+Money AIAccounting::GetCosts()
+{
+	return this->GetDoCommandCosts();
+}
+
+void AIAccounting::ResetCosts()
+{
+	this->SetDoCommandCosts(0);
+}
+
+AIAccounting::AIAccounting()
+{
+	this->last_costs = this->GetDoCommandCosts();
+	this->SetDoCommandCosts(0);
+}
+
+AIAccounting::~AIAccounting()
+{
+	this->SetDoCommandCosts(this->last_costs);
+}