Export both aggregator functions
Revert "Export both aggregator functions"

This reverts commit c8d734a2fd6a57e4ae5b3700e1c5d47632d62e2b.
Export both aggregator functions
Additional host filtering tools
Host filtering should be done in a seperate module
Refactored isValidHost to isValidURI, because it should check URIs instead of Strings.
Insert only links that are allowed to be used
Insert only non-empty groups