3ddot_beta


  Beta version of updating 3ddot.  Right now, *only* doing eta2 tests,
  and only outputting a full matrix to a text file.

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  + COMMAND: 3ddot_beta  -input FILE  -doeta2    \
           {-mask MASK } -prefix PREFIX

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  + OUTPUT:
     1) A single text file with the correlation-like matrix.  If the input
        data set has N bricks, then the matrix will be NxN.

  + RUNNING:
    -input FILE      :file with N bricks.
    -prefix PREFIX   :output test file will be called PREFIX_eta2.dat.

    -doeta2          :right now, required switch (more tests might be
                      present in the future, if demand calls for it).

    -mask   MASK     :can include a mask within which to take values.
                      Otherwise, data should be masked already.


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  + EXAMPLE:
    3ddot_beta                    \
      -input  RSFC_MAPS_cat+orig  \
      -mask   mask.nii.gz         \
      -doeta2                     \
      -prefix My_Matrix_File

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