SciDAVis - Improvements SVN-temp

- some more improvements to the project file

- some corrections in scidavis.pro

- edited the project files and split them into
several files to make them more concise and
make it easier to use a custom project file

- unified the context menus for the title bar and the
project explorer as suggested by Knut
(the related code still needs a lot of cleaning up after
release 0.1.0)

- replaced the green on black data display toolbar by a
status bar at the bottom
Remark: You can copy the text from the
status bar using its context menu.

- fixed some bugs
- modified Double2StringFilter to show empty cells
instead of zeros for empty rows

Fixed Python scripting (broken by renaming).

- started to integrate the new Table class into the
application
Status: It compiles and runs but a lot of functionality
is disabled at the moment, many things are under heavy
construction. At least testing inside the application
is possible now.

- did some left over renaming
- added missing timer stop to main.cpp

- extended the table command test program
- fixed some bugs related to table commands