SciDAVis - Improvements SVN-temp

- Renamed "note" directory to "notes" for consistency.
- Improved build system. In debug mode, modules are now built as dynamic
libraries in order to speed up the edit-compile-test cycle. The modules to be
built can be selected in common.pri. While few users will want to build
without table or notes, this will provide an easy way to avoid having to
install dependencies of modules one does not use, e.g. python or graph3D.
- Added String-IO wrapper around Column in order to avoid creating a temporary
column and reconnecting in/out filters for every access to TableModel.