Ctrl-C; show progress; cleanup.

- treeview disable and show progress during load
- Copy path functionality using Ctrl-C
- RootNode for pre-TreeNode node (first lineNo, node dict) for threads
/was static
- file sort array then addrange
- clean up load clone/non-clone code; clean up min check < vs <=
- File compare still has quick-switch issues
- bandaid issue with blank filename