docs: def alignTwoAlignments(aln1,aln2,outfile,WorkingDir=None,SuppressStderr=None,\
      SuppressStdout=None):
      """Aligns two alignments. Individual sequences are not realigned
  
      aln1: string, name of file containing the first alignment
      aln2: string, name of file containing the second alignment
      outfile: you're forced to specify an outfile name, because if you don't
          aln1 will be overwritten. So, if you want aln1 to be overwritten, you
          should specify the same filename.
      WARNING: a .dnd file is created with the same prefix as aln1. So an
      existing dendrogram might get overwritten.
      """
      app = Clustalw({'-profile':None,'-profile1':aln1,\
          '-profile2':aln2,'-outfile':outfile},SuppressStderr=\
          SuppressStderr,WorkingDir=WorkingDir,SuppressStdout=SuppressStdout)
      app.Parameters['-align'].off()
      return app()