Break lines like latexdiffcite

[fkbreitl]

Latexdiff doesn't break lines with citations correctly. A solution was already developed as a wrapper called latexdiffcite:

https://latexdiffcite.readthedocs.io/en/latest/ https://pypi.python.org/pypi/latexdiffcite

It would be very nice if this solution could be implemented in latexdiff so that the wrapper would not be needed any more.