Where to distribute auxiliary data files?

[Rik]

8/18/14

Matlab comes with a number of data files which they use repeatedly in their
documentation.  Some of the data sources are freely available.  One of
these is the 3-D data for a penny which comes from NIST.  This file has
been made available to Octave, but where should it be placed?

Possible choices:
1) examples/ directory.  Currently this holds only code samples for the
External Code Interface (.oct, .mex files)
2) etc/ directory.  Currently this holds a grab bag of stuff such as NEWS,
doc-cache, config.log, and a directory with the fixed built-in tests.
3) New location.  The imagelib directory is distributed in
local/share/octave/VERSION/imagelib and contains default images and icons. 
Perhaps we need a new data/ directory that contains distributed data files.

--Rik