supercells 1.0.3

C++ code improvements (Avoid implicit conversion from sexp to double, see #39)
Improves documentation of the fun_avg argument (see #41)

supercells 1.0.2

Fixes centroid coordinates (see #32)

supercells 1.0.0

Added a NEWS.md file to track changes to the package.
This version is a stable one as described in Nowosad and Stepinski (2022)