Update list of copyrights
Updated docs for Doxygen 1.9.8.1.
Update ChangeLog and News for version 1.4.1.
version 1.4 of ObjectHandler, QuantLibAddin, and QuantLibXL
Fix a few Doxygen comments.
Version 1.3 of the C++ library.
Version 1.3 of the SWIG extensions.
Tagged XL-Launcher 1.2
Tagged QuantLib 1.2.1