m-editor: open a new file from the directory of the last active tab * file-editor-tab.cc, file-editor-tab.h: new get_file_name method & open_file with a directory * file-editor.cc: request_open_file with the path to the last active file

#include "mex.h"

void
mexFunction (int nlhs, mxArray *plhs[], int nrhs, 
             const mxArray *prhs[])
{
  mxArray *v = mxCreateDoubleMatrix (1, 1, mxREAL);
  double *data = mxGetPr (v);
  *data = 1.23456789;
  plhs[0] = v;
}