Fix #1821: Mimics now activated by all haste effects
Fix Deep Descent description
Fix monster+object list UTF-8 truncation issues.  Fixes #1811
Add tests for utf8_clipto().
Stop randarts getting remove curse effect

Reported http://angband.oook.cz/forum/showthread.php?t=6965
Fix #1810 by having autoconf/configure check for presence of rst2html