gnuplot 4.3: drawing gnuplot binary

[Petr M. <mi...@ph...>]

The following two examples:
1.
    set datafile binary filetype=gpbin
    plot 'binary3' binary with image
2. 
    set datafile binary filetype=auto
    plot 'binary3' binary with image

stopped working after this patch:

  2008-12-02  Ethan Merritt

  * src/datafile.c (plot_option_binary plot_option_array):
  Setting default suboptions for binary file input was documented, but
  never implemented.  Now it is.

Example 1 works OK in gnuplot 4.2.
Example 2 worked in gnuplot 4.3 till 2.12.2008. 
Now it does not work in gnuplot 4.2 nor in new 4.3. However, it is
unclear what format gnuplot expects when there is no format determined
from file's extension. There are warnings:
  plot 'binary3' binary with image
         warning: Unrecognized filetype; try "show datafile binary 
filetypes"
         warning: using default binary record/array structure
But what is it "default binary record structure"?
I think the default filetype should be "gnuplot binary" (compatibility
reasons).

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PM