I merged the linux changes into the main trunk on SVN. It compiles and runs now. I think all the problems are in the UI. The menus quickly quit working and it doesn't repaint when it's supposed to unless I resize it, and the UI is getting some segfaults. Shouldn't be too hard to debug with gdb. I haven't tested if it plays nice with other nodes yet so keep it off-net. build-unix.txt and makefile.unix added
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