isHC -- Checks if a member is on the High Command.
This function checks if a member with id specified by $pin is on the High Command. The council seniors, voting members, non-voting members, alderman, and honorary members are all checked.
This function returns true if the member is on the High Command and false otherwise. This function returns false on failure.
isHC (1) /* Returns true if member with id 1 is a member of HC. If not, false is returned. */