* ImageSaverDialog can now return selected options.
* Viewer: can now start / stop play video sequence and change the
desired frame rate.
* Colormap:
 - fixed color calculation with alpha blending.
 - delete key can be use to remove control point.
 - color component line order modified (alpha is no more at front).
* some fixes in Sequence save operation (better name logic).
* F1 key now opens a browser to the support forum.
* fixed minor issue in plugin installation.
* Somehow replaced "focused viewer" by "active viewer" but that may
change.
* fixed a minor issue with the IJ <---> Icy image transformation action.
* some refactoring.
* removed old deprecated units.
* reworked javadoc generation
* minors changes and tweaks.