Initial data commit

Task/Bitmap-Histogram/Zkl/bitmap-histogram-2.zkl

@@ -0,0 +1,10 @@
+img:=PPM.readPPMFile("lenaGrey.ppm"); // a grey scale image
+median:=histogramMedian(histogram(img));
+median.println();
+
+bw:=PPM(img.w,img.h);
+  // stream bytes from orginal, convert to black/white, write to new image
+  // each pixel is 24 bit RGB
+img.data.pump(bw.data.clear(),'wrap(c){ if(c>median) 0xff else 0  });
+
+bw.write(File("foo.ppm","wb"));