Fix up a mistake in antispam logic where only the user, not any other residents might be blocked.

Adds can_block() to NACLantispam.cpp to unify the blocking checks, so mistakes like this shouldn't happen again.
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Group Feature Request/Bug Fix: Allow setting a log location for any account before log in

The new setting gets overridden by the per account setting, if it has been set, but provides users the ability to set log location pre-login.
[Issue 662] Update llfloaterregioninfo.* in preparation for adding new functionality.