set a diffusion toolBox style in the filtering workspace
Set fancy choose filter comboBox
Avoid weird behavior when switching workspaces
Add about plugin button to filtering toolBox
make the plugin methode of medFilteringAbstractToolBox virtual pure, adjustSize() of QcomboBoxes
Output of filtering process replace the existed one instead of produce an overlay
Merge pull request #60 from rdebroiz/0000-toolbox_filtering

Give same style to the filtering  toolboxes of the filtering workspace than the ones in the diffusion workspace .