proposed graph_analysis.c change

[Ed Beroset <beroset () mindspring com>]

In working on fixing a bug today, I made a proposed change or two to graph_analysis.c.  See 
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7418 for the context.  The first patch was a very conservative one 
that simply added a bit of code to address a problem with not being able to resize the panes.  The second, superseding 
patch is a bit more extensive in that it completely eliminates the pane_callback function.  I thought that I would 
point out that I have only tested the change on GTK+ 3 and not earlier versions, but didn't know how far back we're 
intending to support.  Comments, accolades, brickbats welcome.  :)

Ed
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