add download links to rpm and deb; fix a few others

 - adds download links for the .rpm and .deb for 2.9.2, 2.9.3, 2.10.2,
   2.11.0-M3, 2.11.0 (M2, M3 and M4),
 - add missing source links for 2.9.2 and 2.9.3,
 - fix brocken source link for 2.10.1.

This fixes #113.