Resolved some compiler warnings

chesspp::exception::what was hiding std::exception::what.

Fixed initialization list order in Piece ctor, and gave Piece a virtual
destructor because it's an abstract class.

Author: Stephen Hall

src/Exception.h

@@ -7,7 +7,8 @@
 namespace chesspp
 {
     class exception : public std::exception
-    {	
+    {
+        using std::exception::what;
     public:
         exception() throw() {}
         virtual ~exception() throw() {};

src/board/Piece.cpp

@@ -3,7 +3,7 @@
 namespace chesspp
 {
     Piece::Piece(const Position& bPos, const Position& tPos, Color c, Type t)
-	    :boardPos(bPos), color(c), type(t)
+	    : color(c), type(t), boardPos(bPos)
     {
 	    int tX = tPos.getX();
 	    int tY = tPos.getY() + ( c == WHITE ? 0 : 80 );

src/board/Piece.h

@@ -42,13 +42,14 @@ namespace chesspp
         const Type type;       // What type this piece is. 
 
 	protected:
-
+        
 		posList trajectory;    // The list of possible Positions (see OnValidity.txt)
 		Position boardPos;     // The position on the baord this piece is
 
 	public:
 
 		Piece(const Position& bPos, const Position& tPos, Color c, Type t);
+        virtual ~Piece() {}
 
 		// Standard Accesors
 		const Position& getBoardPos(void) const;