Default increasing_skill_progress to true.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@490 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on November 24, 2006
IX3TFTYD4RYAWYJJGE634KVS4YDFFFI66DSF34VNBJALIKGBP5JQC
Change contents