Set trunk version to 0.8.6
tagged version 0.8.6
Version set to 0.8.6 and CHANGELOG updated.
Merged r2999 from trunk.
Fixed: inline images in wiki headings (#4112).
Merged r2979 and r2980 from trunk.
Merged r2261 from trunk.
Merged r2894 from trunk.
Merged r2924 from trunk.
Locales update * Swedish (#4161) * Traditional Chinese (#4145)