Valrei bugfixes and balancing

• A few bugs that may have prevented Nathan from ascending were found, and he was ascended manually since Fo won this scenario.
• Powers and vitality for deities on Valrei are now recalculated when receiving immortality. The calculated attack and vitality values generated that are higher than 6 will start at 6 and add 0.1 per full point above 6. So a value of 11 will result in 6.5. This will balance the playing field better. Existing deities have had their values recalculated according to this algorithm.