Makefile: added help and distclean target, plus small fixes ccdemos/common_sdl.h: print fps to window caption instead of console update and key callbacks fixed segfault when resizing window pressing c now causes print out of camera coordinates ccdemos/spheres_shadow.cc: controlling position of a light and focal length of camera

ccdemos: put the common code to header files, common_ply.h and common_sdl.h move all ccdemos on octree and make them all realtime (-i argument)