More Work on UEFI

Patrick has integrated more work on making Slackware works with UEFI. It now use a single image usbboot.img rather than having two kinds of image for normal and UEFI system. It's not yet completed, but it's another progres towards a working system.

Other packages are also upgraded as well. They are sqlite, zsh, doxygen, flex, alpine, imapd, iproute2, lftp, and glew. xxgdb is now removed and replaced with ddd, a frontend for GDB debugger.