time_steps to Iterable and index in recycle output

[lthurner]

replaces #604

[codecov-io]

Codecov Report

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@@            Coverage Diff             @@
##             develop     #605   +/-   ##
==========================================
  Coverage           ?   87.48%           
==========================================
  Files              ?      159           
  Lines              ?    14452           
  Branches           ?        0           
==========================================
  Hits               ?    12643           
  Misses             ?     1809           
  Partials           ?        0

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