Fix for ticket 161.

Fix for ticket 161.

Don't multiply the damage multiplier by the number of combo points used by
a combo finisher.  That's too simplistic given the variety of formulas for
scaling the finisher to both combo points and current attack power.

Add OvaleData:GetDamage() that returns the estimated damage for the given
spell using the information from SpellInfo().

Add new script conditions LastSpellEstimatedDamage(id) and
LastSpellComboPoints(id) that return the estimated damage and the number
of combo points consumed by the last cast of spell id, respectively.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@527 d5049fe3-3747-40f7-a4b5-f36d6801af5f