Re-activated the KSpread scripting plugin.

* Well, in fact only _one_ single scripting.(h|cpp) is needed now since we are reusing transparently the dbus-adaptor classes to access the whole KSpread functionality on the fly.
* We are not limited to the dbus-functionality since we are also able to manipulate e.g. the Document or the View class direct.
* Arguments as well as returnvalues are just working. Also not limited to the types dbus knows. We are able to pass QVariant's, QMetaType's as well as e.g. QObject instances.
* The unittest.py contains some first examples to demonstrate that. To see the unittest.py in the "Script Manager" it's for now needed tpo add following lines by hand to your ~/.kde4/share/config/kspreadrc file;
[scripts]
names=unittest
unittest_file=/opt/kde4/share/apps/kspread/scripts/unittest/unittest.py (or wherever you have the python-file)
unittest_text=Unittest