Fixed abjuration (player and monster versions) to work with the new enchantment

duration system. Also strengthened monster abjuration, which became terribly weak after the 0.2 nerf.

Monster abjuration now applies in a circle around the caster, squares adjacent to the caster getting full blast, and weaker abjuration effects going outwards. Player abjuration stays unchanged.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1836 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on July 11, 2007
VQZEJTCSRZ5RVLCCKUCIS3IVZPFYRC26I74X4WIJAPEY7NYID2UQC
Change contents