DNC AF and Relic
Light/Dark arts fix

Changed Light/Dark arts to give a skill bonus, not just raise the skill
max cap, so as to more closely follow the behaviour outlined at
http://wiki.ffxiclopedia.org/wiki/Dark_Arts?oldid=1176123
Dark/Light arts skill max is unchanged

Dark and Light arts don't actually change the skill max, they just give
a bonus
Changed Dark/Light Arts

to behave more like retail, raising skills up to a certain Arts Threshold as per the formula devised here: http://ffxi.allakhazam.com/forum.html?forum=256&mid=1196214921192173460&h=50&p=1#17

The decision to use the E cap as the minimum skill level after which to raise the skill above the Arts Threshold is based on claims of it working that way between skill ranks 200 and 210 at lvl 75 (i.e. between E cap and D cap). http://wiki.ffxiclopedia.org/wiki/Dark_Arts?oldid=1176123
Updated baseline for level 75+
Merge pull request #228 from Jupiter065/dnc_af_and_arts

DNC AF/Relic and  Dark/Light Art changes