Imported Upstream version 17.0.7
Merge tag 'upstream/17.0.7'

Upstream version 17.0.7
adjust icedove depends to >= 17.0.7
document changes and release 1:17.0.7-1
Merge tag 'debian/1%17.0.7-1' into bpo-wheezy
document changes and release 1:17.0.7-1~bpo70+1