add sequential workflow data (#20)

data/sequential_demo/README.md

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+# Sequential demo
+
+Non-realistic example with a single sequential chain of algorithms
+
+## Data flow
+
+![data flow](img/df.svg)
+
+## Control flow
+
+![control flow](img/cf.svg)

data/sequential_demo/cf.graphml

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+<?xml version='1.0' encoding='utf-8'?>
+<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"><key id="d6" for="node" attr.name="blocking" attr.type="boolean"/>
+<key id="d5" for="node" attr.name="node_id" attr.type="string"/>
+<key id="d4" for="node" attr.name="ignoreFilterPassed" attr.type="boolean"/>
+<key id="d3" for="node" attr.name="shortCircuit" attr.type="boolean"/>
+<key id="d2" for="node" attr.name="sequential" attr.type="boolean"/>
+<key id="d1" for="node" attr.name="modeOR" attr.type="boolean"/>
+<key id="d0" for="node" attr.name="type" attr.type="string"/>
+<graph edgedefault="directed" id="G"><node id="0">
+  <data key="d0">DecisionHub</data>
+  <data key="d1">True</data>
+  <data key="d2">False</data>
+  <data key="d3">False</data>
+  <data key="d4">True</data>
+  <data key="d5">RootDecisionHub</data>
+</node>
+<node id="1">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">ProducerA</data>
+</node>
+<node id="2">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">TransformerA</data>
+</node>
+<node id="3">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">TransformerB</data>
+</node>
+<node id="4">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">TransformerC</data>
+</node>
+<node id="5">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">TransformerD</data>
+</node>
+<node id="6">
+  <data key="d0">Algorithm</data>
+  <data key="d6">False</data>
+  <data key="d5">ConsumerE</data>
+</node>
+<edge source="0" target="1"/>
+<edge source="0" target="2"/>
+<edge source="0" target="3"/>
+<edge source="0" target="4"/>
+<edge source="0" target="5"/>
+<edge source="0" target="6"/>
+</graph></graphml>

data/sequential_demo/df.graphml

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+<?xml version='1.0' encoding='utf-8'?>
+<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd"><key id="d4" for="node" attr.name="size_average_B" attr.type="double"/>
+<key id="d3" for="node" attr.name="class" attr.type="string"/>
+<key id="d2" for="node" attr.name="node_id" attr.type="string"/>
+<key id="d1" for="node" attr.name="runtime_average_s" attr.type="double"/>
+<key id="d0" for="node" attr.name="type" attr.type="string"/>
+<graph edgedefault="directed" id="G"><node id="0">
+  <data key="d0">Algorithm</data>
+  <data key="d1">0.10</data>
+  <data key="d2">ProducerA</data>
+</node>
+<node id="1">
+  <data key="d0">Algorithm</data>
+  <data key="d1">0.05</data>
+  <data key="d2">TransformerA</data>
+</node>
+<node id="2">
+  <data key="d0">Algorithm</data>
+  <data key="d1">0.04</data>
+  <data key="d2">TransformerB</data>
+</node>
+<node id="3">
+  <data key="d0">Algorithm</data>
+  <data key="d1">0.03</data>
+  <data key="d2">TransformerC</data>
+</node>
+<node id="4">
+  <data key="d0">Algorithm</data>
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+  <data key="d2">TransformerD</data>
+</node>
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+  <data key="d0">Algorithm</data>
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+  <data key="d2">ConsumerE</data>
+</node>
+<node id="6">
+  <data key="d0">DataObject</data>
+  <data key="d3">DataObject</data>
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+  <data key="d2">a</data>
+</node>
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+  <data key="d2">b</data>
+</node>
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+  <data key="d0">DataObject</data>
+  <data key="d3">DataObject</data>
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+</node>
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+  <data key="d0">DataObject</data>
+  <data key="d3">DataObject</data>
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+</node>
+<node id="10">
+  <data key="d0">DataObject</data>
+  <data key="d3">DataObject</data>
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+</node>
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+</graph></graphml>