Better simulation

[janosg]

• Improve the interface of the simulation functions
• Add functions to visualize the transition equations of a model

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@3ecb78c). Click here to learn what that means. The diff coverage is n/a.

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##             master      #56   +/-   ##
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  Coverage          ?   92.29%           
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  Files             ?       26           
  Lines             ?     1921           
  Branches          ?        0           
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  Hits              ?     1773           
  Misses            ?      148           
  Partials          ?        0           

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