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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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