Release 0.9.0 just hit the web

[Richard B. Kreckel]

Go, grab your copy now, as long as supply lasts!  Don't let others snatch
away the few copies left at <ftp://ftpthep.physik.uni-mainz.de/pub/GiNaC/>!
Hurry!!!  Pronto!!  ¡Rapido!  Los!

The NEWS file says:

* In the output and in ginsh, lists are now delimited by { } braces, and
  matrices are delimited by single [ ] brackets.
* simplify_indexed() renames dummy indices so, e.g.,
"a.i*a.i+a.j*a.j" gets
  simplified to "2*a.i*a.i" (or "2*a.j*a.j").
* New functions/methods:
   - canonicalize_clifford() (helpful when comparing expressions containing
     Dirac matrices)
   - symmetrize() and antisymmetrize()
   - numer_denom() (return numerator and denominator in one call)
   - map() (apply function to subexpressions)
   - evalm() (evaluate sums, products and integer powers of matrices)
* Added a new function match() for performing pattern matching. subs() and
  has() also accept patterns as arguments. A pattern can be any expression,
  optionally containing wildcard objects. These are constructed with the
  call "wild(<unsigned>)" and are denoted as "$0", "$1" etc. in the output
  and in ginsh.
* Positive integer powers of non-commutative expressions (except matrices)
  are automatically expanded.
* Removed cint subdirectory, ginaccint is a separate package now due to
  packaging considerations.
* Several little bugfixes.
* More exclamation marks than ever in the announcement.

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