Changed accept source dialog StaticTexts holding data into read-only 
TextCtrls so that their values can be copied.  The formatting looks bad 
though and will need to be fixed.  Also, it needs to be clearer which 
values can be edited and which can't (some styling).
Read-only fields in the accept source dialog now has the background 
colour set to be the same as the background of the rest of the dialog.
Cleaned up accept source dialog layout using FlexGridSizer.
Merge pull request #112 from drusk/copyable_ui

partially addresses #111