CVS commit by mornfall: Refactor ListTreeWidget, make it play nice with the refactored Tree / Node / Grouper stuff. To explain more about the recent changes in Tree construction/refresh process: I shunned the Feeder concept, replacing it with NodeProducer; this pushes creation of TreeNodes into sooner phases of construction. All groupers now operate on TreeNode pointers instead of pkgCache::*Iterator. Also, the nodes are now more persistent, being reconstructed only on pkgCache changes; groupers can operate on existing trees now instead of constructing new ones every time.
M +36 -9 libcapture/tree.cpp 1.6 M +6 -0 libcapture/tree.h 1.5 M +2 -3 libkapture/listtreeview.cpp 1.8 M +62 -40 libkapture/listtreewidget.cpp 1.9 M +8 -3 libkapture/listtreewidget.h 1.3
