Merge awernerdlr's template polynomials.
polynomial.cc: fix style.
polynomial.hh: fix style and missing doc.
polynomial.hxx: fix style.
polynomial: fix compilation.
polynomial: fix test.
polynomial.cc: add missing implementation.
polynomial: add real root finder.
polynomial: fix operators.
Merge pull request #11 from bchretien/polynomials

Add template polynomials