misc: added CMake check for libjpeg-turbo v6 (dynamic linking only), refs #329 refs #162

Required for Fedora.
misc: updated dependencies list in README
misc: use unix eol and utf-8 encoding in license file
misc: install man page on unix
client: removed mac mouse acceleration hack
It was an abandoned experiment in ioq3 and messed with the mouse tracking too much to be desirable.
misc: FindJPEGTURBO.cmake sets standard JPEG pathes, refs #329
IRC: make it connect straight to our channel
misc: update for translation files, refs #244
misc: moved tinygettext dependency internally, fixes #500
misc: moved tinygettext files, refs #500
client: workaround for OS X gamma reset bug
client: avoids vid_restart if win didn't resize

On OS X at least, it's possible to receive a resize event when the window simply moves, or even when Dock shows/hides. No need to do a vid_restart then, so it does a simple check.