Faren ranged upgrade

On closer inspection, I realized that one of the reasons Faren ranged
spells are so bad is that their superclass has a Mana Focus bonus of 10
damage, instead of 5 like splash spells. Lightning Bolt and Fireball
were probably given very low damage ranges because they were 'intended'
to be used with Mana Focus. Since that didn't work out in practice, the
spells were left severely underpowered. I took 5 of that Mana Focus
bonus away and simply put it back into the spells.