Removed a "optimisation" that broke with the update to VTK 5.10
Fixed a bug when an interactor was adding new data, messing up the layer order
Merge pull request #140 from fvichot/upgrade-vtk-5.10-fix

Fix bug introduced by upgrading to VTK 5.10
Refactoring the diffusion workspace to make it more modular
Post rebase changes (view refactoring related changes)
Solve newly introduced bug from rebase: multiple tabs were not handled anymore
Reconnect cancelled and failure signals in diffusion workspace
Really enable canceling, takes place of the run button
Getting rid of medDropSites, everything is controlled from tabs. Also, view interaction is now disabled during process run
Make fiber bundling toolbox use all scalar fields in images, plus tensors for retro-compatibility
Add option to save bundles as individual files in database
Correct some interface bugs
Update process creation system: process is created by workspace
Make bundle names editable. Should be propagated to the actual fiber dataset
Bundle renaming is now propagated to fiber datasets
Remove comments
Cleaning in changeBundlingItem
Disable diffusion selector toolboxes by default
Correct bugs in diffusion workspace and remove gradient pop-up
Code simplification