[Fluxus] nuke button + png saving commits

[gabor papp]

unfortunately the current cvs segfaults on osx, it seems to be caused by 
the (clear) in boot.scm. any idea why this happens? backtrace is attached.

best,
gabor


(gdb) backtrace
#0  0x907d45e4 in glEnable ()
#1  0x0229c0eb in Fluxus::Renderer::AddLight (this=0xbfffe1bc, 
l=0x743390) at libfluxus/src/Renderer.cpp:404
#2  0x0229c1d0 in Fluxus::Renderer::ClearLights (this=0x882000) at 
libfluxus/src/Renderer.cpp:428
#3  0x0224ce2f in clear_engine (argc=0, argv=0x1ad8fa4) at 
modules/fluxus-engine/src/GlobalStateFunctions.cpp:68
#4  0x00731095 in ?? ()
#5  0x004187a1 in scheme_do_eval ()
#6  0x00418e2a in _scheme_apply_multi_from_native ()
#7  0x0080c189 in ?? ()
#8  0x004187a1 in scheme_do_eval ()
#9  0x00432660 in finish_apply_with_prompt ()
#10 0x0041872f in scheme_do_eval ()
#11 0x0043c15c in scheme_finish_apply_for_prompt ()
#12 0x0043c2d4 in scheme_apply_for_prompt ()
#13 0x0043cce5 in call_with_prompt ()
#14 0x004183b5 in scheme_do_eval ()
#15 0x0043d3bc in do_call_with_prompt ()
#16 0x0043d5b1 in do_apply_with_prompt ()
#17 0x004b7358 in do_load_handler ()
#18 0x0043fba6 in scheme_dynamic_wind ()
#19 0x004b7c4f in default_load ()
#20 0x004183b5 in scheme_do_eval ()
#21 0x004b7e8a in scheme_load_with_clrd ()
#22 0x004b7ede in load ()
#23 0x004183b5 in scheme_do_eval ()
#24 0x0041c78a in eval_k ()
#25 0x00431f38 in top_level_do ()
#26 0x00432144 in scheme_top_level_do ()
#27 0x0041cc2f in scheme_eval_compiled_multi ()
#28 0x0041cc81 in scheme_eval_multi ()
#29 0x0041ce11 in do_eval_string_all ()
#30 0x00007e8d in fluxus::Interpreter::Interpret (str=@0xbfffe1bc, 
ret=0x0, abort=true) at src/Interpreter.cpp:150
#31 0x000081ad in fluxus::Interpreter::Initialise () at 
src/Interpreter.cpp:77
#32 0x00010ff0 in main (argc=1, argv=0xbffff988) at src/main.cpp:189