upload demo/d_libcurl
demo/d_file.check_isfile
upload demo/d_net ,which builds up server/client
upload demo_sh written long ago, rm ._*
demo_stl d_pair.cpp , d_set
demo_python/p_basic/, p_draw, p_pil
add checkout.py to checkou each time file moves
upload d_net/srv*.cpp
last patch