[#134] Reintroduce radius1 and radius2
[#134] Reintroduce radius1 and radius2

We keep the functions `radius1` and `radius2` around for testing
purposes. These tests will provided in a future commit.

abelfunctions/abelfunctions,cswiercz/abelfunctions,abelfunctions/abelfunctions,cswiercz/abelfunctions,cswiercz/abelfunctions,abelfunctions/abelfunctions