Extract the layer 2 link structure out of struct pri.
This completes the layer 2 link and Q.931 call control restructuring. Some code is now simplified since there is only one D channel control structure and the amount of allocated memory is reduced. git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@2077 2fbb986a-6c06-0410-b554-c9c1f0a7f128
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