fixed several typos in docs; make MLData capable of reading csv files with much more columns than before

doc/core_introduction.tex

@@ -183,7 +183,7 @@ void drawCircle(Mat &image, int R, Point center)
 }
 \end{lstlisting}
 
-\section{Namespace \texttt{cv} and Function Naming}
+\section{Namespace cv and Function Naming}
 
 All the newly introduced classes and functions are placed into \texttt{cv} namespace. Therefore, to access this functionality from your code, use \texttt{cv::} specifier or \texttt{"using namespace cv;"} directive:
 \begin{lstlisting}