Initial Download Support.
Added a download_module to handle download request (with hardcode implementation as a proof of concept)
Updated Eiffel lang service class and the promo template.



git-svn-id: https://svn.eiffel.com/eiffelstudio/trunk@95976 8089f293-4706-0410-a29e-feb5c42a2edf
Added editing capability in the vision2 desktop app.
Fixed various issue with WDOCS_MANAGER, to render a wiki page outside the data/documentation/... folder.
Fixed infinite recursion dealing with parent path.

git-svn-id: https://svn.eiffel.com/eiffelstudio/trunk@95977 8089f293-4706-0410-a29e-feb5c42a2edf