Przemysław Pawełczyk authored Jan 26, 2018 and Natanael Copa committed Jan 26, 2018

Changes:
- Support aspect ratio geometry, e.g. -crop 3:2.
- Add support for reading the HEIC image format.
- Fix IM build when HEIC is enabled.
- Fixed numerous memory leaks, credit to OSS Fuzz.

It's worth to note that upstream sadly removes tarballs of old releases,
so for instance ImageMagick-6.9.9-33.tar.xz is no longer available.