SciDAVis - Improvements SVN-temp

- improved the options tabs gui form
- implemented copy&paste, label/comment changing and
column type changing in Table/TableView
- moved selection related function from Table
to TableModel
- improved AbstractFilter::input() which was a speed
killer and is very often called by TableModel::data()

- added link to Debian packages to the downloa page

- implemented undo/redo for Double2StringFilter
and String2DateTimeFilter

- started implementing undo for simple filters
- fixed handling of obsolete column modes
- finished load/save for columns
- added some more test cases to the column test

- implemented save/load for all simple filters

- creating new tag 0.1.1 with correct splash screen

- removing obsolete tag 0.1.1

- updated splash screen

- tagging version 0.1.1

- some more bug fixes