Overview
 Function  IsDir      (FDir:String):Boolean;
 Procedure GoDir      (FDir:String);
 Procedure DelSlash   (StIn:String;Var StOut:String);
 Procedure AddSlash   (StIn:String;Var StOut:String);
 Procedure InitDirList(Var Dir:DirList);
 Procedure GotoDirList(Var Dir:DirList;Num:Word);
 Procedure KillDirList(Var Dir:DirList);
 Procedure LoadDirList(Var Dir:DirList;Mask:PathStr;Attr:Byte;IncDir:Byte);