Small fixes as always, + add pi program

src/programs/programs.h

@@ -17,6 +17,7 @@ void get_meminfo(unsigned int multiboot_info_address);
 void program_conway();
 void program_cowsay();
 void cowsay(); // Splash screen
+void program_pi();
 
 // Ciphers
 void program_rot13();