Summary of important user-visible changes for dataframe 1.1:
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 ** dataframe 1.1.0 is a major update. As it introduces new functions, if 
    dataframe-1.0.1 was previously loaded, Octave has to be restarted.
    Significants changes:
    - the structure of "row empty", i.e. dataframes with [0, n] size,
      is fully displayed
    - the "_src" metadata is now correctly set
    - new function: nth_element, make it compatible with median. Note 
      that only row-median and page median are implemented, using directly
      the underlying data structures
    - new function; numel. Only the one argument form is supported.
    - bsxfun now better handles array as first arguement
    - vector vs matrix plot are now supported, provided both data set possess
      the same colum length. 

