Add section BUGS to manual page describing headless operation in Linux #3062
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This addresses issue #1981 and (partly) #3054: Currently AWT initializes the GUI code and thus needs to have a GUI present. This breaks command line builds on headless linux system. This patch adds a section "BUGS" to the manual page with a simple workaround. I decided to use "BUGS" since CLI mode should require no Xserver and no X11 libraries in the best case.