tweak name of function for writing positional Di

src/msa_stats.cpp

@@ -163,7 +163,7 @@ MSAStats::writeRelEntropyGradientAscii(std::string output_file)
 // };
 
 void
-MSAStats::writeRelEntropyPos(std::string output_file)
+MSAStats::writeRelEntropyPosAscii(std::string output_file)
 {
   std::ofstream output_stream(output_file);
   for (int i = 0; i < N; i++) {

src/msa_stats.hpp

@@ -15,8 +15,8 @@ public:
   double getQ();
   void writeRelEntropy(std::string);
   void writeRelEntropyAscii(std::string);
-  void writeRelEntropyPos(std::string);
-  // void writeRelEntropyPosAscii(std::string);
+  // void writeRelEntropyPos(std::string);
+  void writeRelEntropyPosAscii(std::string);
   void writeRelEntropyGradient(std::string);
   void writeRelEntropyGradientAscii(std::string);
   void writeFrequency1p(std::string);