improve HDF5Viewer, add lock for await_finalize #69
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While trying to add more multithreading to the example HDF5Viewer, I ran into a crash. The code involves populating a GtkTreeModel in a separate thread, which triggers the finalizing code in that thread. Adding a lock around all operations involving the set "await_finalize" fixed it.
Judging by JuliaGraphics/Gtk.jl#694 there is probably a lot more we need to do, but I am not sure what's the best strategy. This fixes my issue so I'll just add this for now.