Replace TSO's Smiting with Divine Shield.

Actually, I wasn't entirely sure which of the many attack invocations to replace and I chose Smiting mostly because of the new overlap with Zin and because such a change is easiest to revert (copy code from Zin). :p

Divine Shield strengthens existing shields (also magical, which might have to be excluded) or else creates a new magical one. Either way, the shields value is increased by 3 + skills(SHIELDS)/5 and this bonus lasts for 5 + (skills(SHIELS) + 2*skills(INVOCATIONS))/6 turns, after which it is decreased by 1 every two out of three turns until it reaches 0.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3225 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on January 8, 2008
KKEPQAZMWQFWPQ4P4KT5PWG2YFPG7H4JHL5K7USVHQ3Y6L4NWURQC
Change contents