NmzCone: Accept arbitray lists, not just plists

[fingolfin]

So e.g. ranges.

Fixes #121

CC @pedritomelenas

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.49%. Comparing base (753a9c0) to head (1a564c0).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/normaliz.cc	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   80.49%   80.49%           
=======================================
  Files           5        5           
  Lines         764      764           
  Branches       44       44           
=======================================
  Hits          615      615           
  Misses        130      130           
  Partials       19       19           

Files with missing lines	Coverage Δ
src/normaliz.cc	73.92% <66.66%> (ø)

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[pedritomelenas]

Thanks