nicer tooltip display for widget inputs and outputs; I don't know how to make it refresh/apply after adding a new widget

Added context menu on treeview widget repository for categories and widgets to directly access admin console.
Reorganised context menu
Run widget with hieraricaly running all predeccessos
Reset widget
Reset workflow

Added alter table widget for editing orange tables. Still TODO: for discrete variables a dropdown list of legal values should appear when editing.

Widget configuration access link was added to the parameter dialog window (at the bottom).
User can configure his widget by:
- manually reordering inputs, outputs and parameters
- moving inputs to parameters and vice versa
Implementation required two new fields to be added in the database Input.order and Output.order

Some of the most important functionalities:
- latino dlls - compiled c# sources (not sure if this should be added at all, however it is an integral part?)
- latino python interfaces (latino.py and in library.py)
- modifications of platform: run widget recursive, parameters configuration, improved context menu, context menu icons, advanced object initializer