Merge branch 'crashlog_improvements' into jgrpp

# Conflicts:
#	source.list
#	src/openttd.cpp
#	src/stdafx.h
#	src/vehicle.cpp

src/command_type.h

@@ -162,6 +162,21 @@ public:
 	{
 		return !this->success;
 	}
+
+	/**
+	 * @param cmd_msg optional failure string as passed to DoCommand
+	 * @return an allocated string summarising the command result
+	 */
+	char *AllocSummaryMessage(StringID cmd_msg = 0) const;
+
+	/**
+	 * Write a string summarising the command result
+	 * @param buf buffer to write to
+	 * @param last last byte in buffer
+	 * @param cmd_msg optional failure string as passed to DoCommand
+	 * @return the number of bytes written
+	 */
+	int WriteSummaryMessage(char *buf, char *last, StringID cmd_msg = 0) const;
 };
 
 /**