Changes to 0.7.1 * Run EPS output through ps2epsi if it's there which adds a bitmap preview, even though this bitmap preview is fairly crappy * Add PNG export for plots * Remove some parenthesis from output where they are not needed * SYNTAX: InfiniteSum, InfiniteSum2, InfiniteProduct, InfiniteProduct2, now no longer take the tolerance argument and behaviour is controlled by the SumProductTolerance, SumProductSFS and SumProductNumberOfTries like other limits and they return null when limit can't seem to be found * Add: NumericalLeftDerivative, NumericalRightDerivative * Fix the NumericalLimitAtInfinity function and its use and with that fix NDerivative (which is now an alias for NumericalDerivative), IsContinuous, IsDifferentiable, Limit, LeftLimit, RightLimit * Fix the specfile and custom CFLAGS are added after the default ones (Florin Andrei, me) * LinePlot and SurfacePlot no longer crash when called without arguments * Fix EPS/PS export for older gtk * Fixup compilation of GtkExtra-2 with gcc 3.4 * Bunch of "optimizations" and minor fixes