util.signal: Moved a variable declaration to the top of a function, for ANSI C compliance.

util.signal: Removed #include <sys/param.h>, as it appears unnecessary.

util.signal: Make kill() available on OS X (thanks darkrain).

MUC: A little modification to improve code analysis.

MUC: Updated room:set_role() to use room:can_set_role().

MUC: Added room:can_set_role().

mod_announce: A little cleanup.

mod_storage: Make DBI a soft dependency, not a hard one.

mod_announce: Removed unused variables.

mod_announce: Changed a global variable to local.

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