Adds an ACL entry to this ACL. An entry associates a principal (e.g., an individual or a group) with a set of permissions. Each principal can have at most one positive ACL entry, specifying permissions to be granted to the principal. If there is already an ACL entry already in the ACL, false is returned.
@param entry - the ACL entry to be added to this ACL
@return true on success, false if an entry of the same type (positive ornegative) for the same principal is already present in this ACL
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