* fixed a typo in /unix/user_install.htrw
* updated images in /tutorials/Lite_Quickies
* added quintet_hst_big.jpg, crop-dialog.png, info-dialog.png
* added AS17-148-22727.jpg, AS17-148-22727_lrg.jpg, earth_1_apollo17_big.gif
* fixed xhtml /tutorials/Lite_Quickies/index.htrw,jpegrace.htrw,flips.htrw
* removed mode-alphano.png, mode-flatten-menu.png, mode-gifno.png, mode-jpegno.png, mode-menu2.png, mode-sample.png, mode-sample2.png