[submit] gsl_interp_polynomial, gsl_polynomial types

["Dan, Ho-Jin" <hjdan at sys713 dot kaist dot ac dot kr>]

these files are submitted for the polynomial interpolation functioning
in gsl library.

o gsl_interp_polynomial type based on Newton's divide difference is added
o gsl_polynomial type is added for higher-lever interfaces.
o all of lower-level requirements are filled.
o higher-level functions are similar to those of cspline type but
  gsl_polynomial type doesn't need the index look-up mechanism so the
  accerleration argument is omitted.
o simple tests are supplied in "interp_poly_test.c"
o further interfaces to Rootfinding Polynomial will be submitted sooner 
or later.

please suggest any idea to improve and clean the codes.
mailto:hjdan@sys713.kaist.ac.kr

Yours
Dan, Ho-Jin

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