PBot will now use weak links if the ip address portion of a hostmask
hasn't been seen in the last 48 hours in order to prevent false-positive
linking of dynamic ip addresses.
Weak links are excluded from ban-evasion logic.
Weak links can be manually upgraded to strong links with the `akalink`
command if a human confirms they are the same person through the `aka -w`
command.
Individuals with matching nicks or matching nickserv accounts, etc, will
automatically be strongly linked, as usual.
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