move 'cycles' from agent constructor argument to parameter

[sbenthall]

Fixes #1030

• Updated documentation of features that add new functionality.
• Update CHANGELOG.md with major/minor changes.

[codecov-commenter]

Codecov Report

Merging #1031 (7efe5b3) into master (18c410d) will decrease coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1031      +/-   ##
==========================================
- Coverage   72.41%   72.23%   -0.18%     
==========================================
  Files          66       66              
  Lines        9865     9870       +5     
==========================================
- Hits         7144     7130      -14     
- Misses       2721     2740      +19     

Impacted Files	Coverage Δ
HARK/core.py	89.67% <ø> (+0.20%)	⬆️
HARK/ConsumptionSaving/ConsGenIncProcessModel.py	83.18% <100.00%> (-5.90%)	⬇️
HARK/ConsumptionSaving/ConsIndShockModel.py	85.84% <100.00%> (ø)
HARK/ConsumptionSaving/ConsLaborModel.py	82.90% <100.00%> (ø)
HARK/ConsumptionSaving/ConsMarkovModel.py	86.08% <100.00%> (ø)
HARK/ConsumptionSaving/ConsMedModel.py	74.04% <100.00%> (ø)
HARK/ConsumptionSaving/ConsPortfolioModel.py	66.57% <100.00%> (ø)
HARK/ConsumptionSaving/ConsPrefShockModel.py	79.68% <100.00%> (ø)
HARK/ConsumptionSaving/ConsRepAgentModel.py	100.00% <100.00%> (ø)
HARK/ConsumptionSaving/ConsRiskyAssetModel.py	85.93% <100.00%> (ø)
... and 6 more

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[sbenthall]

ready for review

[mnwhite]

Yes, this is what we want.