Copy/Paste buttons get greyed out in the editor correctly again. Removed margin in editor tabs and status bar. * FileEditor: Removed status bar and added slot to handle changes in tabs. * FileEditorTab: Removed margen and added signal when copying is possible.

#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;
}