Patch release for 1.15 that fixes incorrect behavior and improves the stability of the engine.

• Fixed a couple of potential memory access violations 2089
• Updater: Fixed a crash when parsing the version number information 2080
• Hexen: Spurious warning messages about music no longer being shown (“ignoring unknown music in TranslatedMapinfos”) 2083
• Hexen: Rare crash when spawning a missile 2088
• Ubuntu: “doomsday-stable” package on Launchpad is pretty much empty 2095

• Roadmap: 1.15.1
• 1.15 release notes