The library is installed in ure/lib. Thanks Stefan Bergman for the pointer.

...which required some Reference namespace clean up.

...also improved the code somewhat.

SwDoc::MakeFlySection: abuse the SwDoc::mbRedlineMove flag, which
(with the fix for fdo#40599) does exactly what is necessary to prevent
the spurious copies.
Also, remove the ugly hack to work around this problem from
SwXText::convertToTextFrame.

SwDoc::CopyFlyInFlyImpl: When called from SwRedline::CopyToSection, do not
copy frames that are anchored at the redline end node by checking
IsRedlineMove(); these frames are not deleted by DelCopyOfSection and were
thus duplicated on every Show/Hide redlines.
(regression from 62ebbb00 (CWS os131))