Converte .dmat to binary .dmat

rewrite_as_binary_dmat.cpp

#include <igl/writeDMAT.h>
#include <igl/readDMAT.h>
#include <cstdlib>
#include <iostream>
int main(int argc, char *argv[])
{
  if(argc == 1)
  {
    std::cout<<R"(
Usage:

  rewrite_as_binary_dmat fileA.dmat 
  rewrite_as_binary_dmat fileA.dmat [fileB.dmat ...]

Read and then re-write (overwrite) .dmat file(s) using binary format. 
)"<<std::endl;
  }
  Eigen::MatrixXd X;
  for(int i = 1;i<argc;i++)
  {
    if(! (igl::readDMAT(argv[1],X) && igl::writeDMAT(argv[1],X,false) ))
    {
      return EXIT_FAILURE;
    }
  }
  return EXIT_SUCCESS;
}