SciDAVis - Improvements SVN-temp

- updated the unit tests/test programs
- fixed a bug in Column::load()
- some small improvements to Table and TableView
- some other minor changes

- added page about plans and tasks

- matrices are now saved as XML and can be loaded
from 0.2.x as well as 0.1.x project files

- revised the coding page and the roadmap a little

- removed a lot of obsolete code
- fixed a small issue in future::SortDialog
- added AbstractPart::fillProjectToolBar() analoguous
to fillProjectMenu() and implemented it for Table

Progress in the integration of future::Table:
- plotting now works from the main as well as the context menu
- I have decided to postpone the conversion from the string based
column lists to Column* based lists as this would be very
much work. It's questionable whether this makes sense to be done
before writing the new plotting engine anyway. For this reason
now Table::text() returns the the cell text given by the
model. This works well for numeric columns and probably text
columns as well. Have not tested date-time columns yet.
- reorganized the context menus
- added the necessary actions from the old Table menu to the new
one and removed the old one.
- disabled all masking related code as I don't plan to implement
masking support in 0.2.x already
- fixed the title bar menu for tables

- Did some work on the future::Table integration.
Status: It compiles and runs but most of the
functionality is disabled currently, still
a lot of work to do.
Remark: I disabled Python temporally to avoid having to port
the string based column lists to Column * based column
lists into scidavis.sip immediately. This commit
already breaks some of the Python bindings.

- roadmap update

Fixed error in previous commit.

Added section to the manual describing how to import a system-wide configuration file from a per-user one.