[Bug-plotutils] memory leaks when using libplotter

[Lukasz Grabowski]

Hi, the following code grows up to 5% of memory of my 512Mb laptop:

#include <plotter.h>

int main() {
        XPlotter ploter(cin, cout, cerr);
        ploter.openpl();
        ploter.fspace (0, 0, 10, 10);
        for(int i=0;i<100000;i++){
                ploter.fontsize(20);
                usleep(10);
        }
        ploter.closepl();
        cin.get();
        return 1;
}

The same happens when using double buffering, which makes longer
animations that change parameters (fontsize, pencolor, etc...)
impossible with libplotter:

#include <plotter.h>

int main() {
        XPlotter ploter(cin, cout, cerr);
        ploter.parampl("USE_DOUBLE_BUFFERING", (void*) "yes");
        ploter.openpl();
        ploter.fspace (0, 0, 10, 10);
        for(int i=0;i<100000;i++){
                ploter.fontsize(20);
                ploter.erase();
                usleep(10);
        }
        ploter.closepl();
        cin.get();
        return 1;
}

Best regards,
Lukasz Grabowski