Fix 1920778: mons_open_door() not respecting gates

Also fixed several cases where secret doors would be described as rock walls regardless of their actual type, and gates are now described correctly as well. This means that viewing them also prints, e.g. "An open gate." or "A closed large door." without further information since there are no database entries for these specific cases. (Not the entries for simple doors are any more exhaustive.)

Fix 1910729: Yredelmnul's Drain Life not waking monsters, using ncampion's solution.

Also default greedy_explore to true. (FR 1911112)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3584 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on March 10, 2008
MFONX2CQ4V7HA5NSD6P5NDDBXYDSKIOCYUKRZXJ4ZER2OKJWT2HQC
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