Consolidate summon_ugly_thing() into summon_ice_beast_etc(), and rename

the latter summon_general_creature().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5511 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on June 6, 2008
KLCR26P7MSX4ZWIHQHRK7BZH7M2QGCITN46FCFVHNX7U7WQWYDAQC
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