2.15.13
==

Thanks to Björn Lindqvist and Thomas Thurman for improvements in this
release.

 - grab alt+shift+button1 when trying to snap-move windows (Björn)
 - avoid a case where memory is written after it's freed (Thomas)

Translators
 Hendrik Richter (de), Kostas Papadimas (el), Jonathan Ernst (fr),
 Satoru SATOH (ja)