Bukkit

Added event 'at <time> [in <worlds>]', e.g. 'at 18:00 in "world"'
Added condition 'is PvP enabled/disabled [in <world>]' and effect 'enable/disable PvP [in <world>]'
Added expression 'light level at <block>', with sky light and block light variations
Changed how timespans are displayed
Fixed player in commands being replaced with their display name which can cause problems if used in other plugin's commands
Allowed events to fire themselves, allowing for a more efficient periodical event an an otherwise very inefficient 'on walk on' event

commit: https://github.com/Njol/Skript/commit/43f8392897cb3c7963bbb725876a047e031f07e8

The default location of many block events is at an entity and vice versa. I know the cause but not how to fix this tidily.
The damage in damage events is still the raw damage, i.e. without any armour/critical/enchantment modifidicators applied.
If no world is specified in a periodical event no errors are printed if one uses the event-world (e.g. by using 'time' instead of 'time of <world>'), but it will fail silently when the script is executed.

see also: https://github.com/Njol/Skript/issues?labels=bug&page=1&state=open