* #include'ing ginac.h defines the preprocessor symbols GINACLIB_MAJOR_VERSION,
GINACLIB_MINOR_VERSION, and GINACLIB_MICRO_VERSION with the respective GiNaC
library version numbers.
+* Expressions can be constructed from strings like this:
+ ex e("2*x+y", lst(x, y));
+* ex::to_rational() provides a way to extend the domain of functions like
+ gcd() and divide() that only work on polynomials or rational functions
* Several new timings in the check target. Some of them may be rather rude
at your machine.