Fix error in how variable quantities are added and subtracted.

The values should be appropriately scaled by the origins in the case where
the quantities are "parallel" to each other.

Also fix NextTick() condition to account for the math correction.

git-svn-id: svn+ssh://svn.curseforge.net/wow/ovale/mainline/trunk@685 d5049fe3-3747-40f7-a4b5-f36d6801af5f
Fix documentation for IsFriend(), TickTime() and TimeToDie() conditions.

git-svn-id: svn+ssh://svn.curseforge.net/wow/ovale/mainline/trunk@686 d5049fe3-3747-40f7-a4b5-f36d6801af5f
Update copyright due to recent changes.

git-svn-id: svn+ssh://svn.curseforge.net/wow/ovale/mainline/trunk@687 d5049fe3-3747-40f7-a4b5-f36d6801af5f