SciDAVis - Improvements SVN-temp

- Added deprecation annotation to all Python methods marked as such in the
current draft manual, so that using them will generate a warning.

- Updated and rearranged Linux section on download page. Removed names of
package authors/maintainers, since the list was incomplete and trying to keep
it in synch with the developments in various distributions doesn't seem
feasible.

- Update of Czech translation by Pavel Fric.

- Implemented picking of data points from Python scripts, i.e. querying the user
to select a point of a curve on a given graph layer.

- More efficient ASCII export of (large) tables.

- Clarified colormap file format.

- Fixed remaining issues with inserting columns and Qt 4.6. Closes bug #2935369.

- Fixed crash when creating a table with given Column objects.
- Fixed performance issue in Differentiation (when applied to large tables).

- Updated download page to point to the LabPlot repository for the development
version.

- Added link to API documentation of the development version.

- Webpage ported to webgen 0.5.x.

- Some pages updated. Better screenshot on index page.

- Removed outdated description of Aspect framework. Will be replaced with an API
documentation for the development version, which is easier to keep up to date.