Merge pull request #18 from zhouguangfu/master

display the cross hover or not
Merge pull request #19 from zhouguangfu/master

Fix mouse hover status
update TODO
Merge pull request #20 from sealhuang/update-todo-list

update TODO
Merge pull request #21 from zhouguangfu/master

Voxel time points curve
Merge pull request #22 from zhouguangfu/master

Combine get_value(..)  function and get_voxel_time_points(...),delete get_voxel_value(..) function.
add multi label edge detection
merge new version
merge edge_detection in main.py
Merge pull request #23 from liuzhaoguo/add_multi_label_edge_detection

Add multi label edge detection
Add time_course parameter in get_current_value(...) function explicitly, just like get_current_value(..., time_course=True).
Merge branch 'master' of github.com:BNUCNL/FreeROI