Bug#919923: pysolfc should be updated to 2.4.0

[Shlomi Fish]

Package: pysolfc
Version: 2.0-4

https://pysolfc.sourceforge.io/ is currently at version 2.4.0 with many
improvements including support for python 3. Please update to the new
version.
Note that here - https://github.com/shlomif/PySolFC/issues/88 - @hlef who
told
us they are a debian dev said he is working on that but then told us he
became
busy.