[lyx/f16] (4 commits) ...New bugfix release

[jamatos]

Summary of changes:

  981445e... Require ImageMagick (#753626) (*)
  b115066... - Rebuilt for c++ ABI breakage (*)
  372b4ea... hack around gcc-4.7 ftbfs for now (*)
  5ba2f6c... New bugfix release (*)

(*) This commit already existed in another branch; no separate mail sent