This is a new maintainance release after one year of very low activity.
Main news are:
* Fix an infinite loop condition in retrosyntheses alignment.
* Don't crash when importing an invalid string. [Redhat bug #1285154]
* Fix drawing when zoomed.
* Fix various runtime errors.
* Fix crash when creating a reaction with no product.
* Enhanced Chemdraw CDX format support.
* Fix embedding of a whole molecule inside brackets. [#47224]
* Don't crash when showing an already existing chart. [Redhat bug
* Fix build with gcc-6. [Redhat bug #1307546]
GCrystal and GChem3D:
* Don't crash when rendering to memory (images and print).