New version of graph.py started

Created README for the project with development plan for
implementing graph.py using Graphviz library:
- new_graph.py will replace graph.py

Changed text order in styrman-blocks.yml for correct ordering
of people in the tree at 'label: 8. sukupolvi, Antti Jokisen
lapset'.

README.md

@@ -0,0 +1,24 @@
+
+# Puudot
+
+## Development
+
+Start implementing graph.py with Graphviz Python library.
+
+New architecture for creating dot. No clusters; one node contains one row table with each column for a person.
+~~~
+dot.node('<this node id>', fr'{(<node id>) <text>}|...')
+dot.edge('<this node id>:<other node id>', '<other node id>')
+~~~
+
+algorithm:
+~~~
+    for block in blocks
+        create node
+            if block has link, set link as id
+            else create id
+            add texts to node
+            for text in block save links
+    
+    create edges from links
+~~~

code/new_graph.py

@@ -0,0 +1,41 @@
+import graphviz
+
+class Graph:
+    def __init__(self):
+        self.dot = None
+        self.edges = []
+        self.node_counter = 0
+    
+    def create_graph(self, config, data):
+        # TODO: process config, use for graph init
+        self.dot = graphviz.Graph()
+
+        blocks = data.get('blocks', [])
+        for block in blocks:
+            self.node_counter += 1
+
+            # Create node id
+            node_id = f'f{self.node_counter}'
+            links = block.get('links', [])
+            if len(links) > 0:
+                node_id = f'{links[0]}'
+            
+            # Create text table for node
+            texts = []
+            for text in block.get('texts', []):
+                person = text.get('text', '')
+                link = text.get('links', [])
+                if len(link) > 0:
+                    person = f'<{link[0]}> {person}'
+                    self.edges.append((link[0], f'{node_id}:{link[0]}'))
+                texts.append(person)
+            
+            # Add node
+            table = "|".join(texts)
+            self.dot.node(node_id, fr'{table}')
+        
+        # Add edges
+        self.dot.edges(self.edges)
+    
+    def __str__(self):
+        return self.dot.source

data/styrman-blocks.yml

@@ -1660,6 +1660,11 @@ blocks:
     label: 8. sukupolvi, Antti Jokisen lapset
     links: [54]
     texts:
+    - text: |
+        Tapio Juhani
+        Jokinen
+        s.20.04.1975
+        k.
     - text: |
         Sanna Maaria
         Jokinen
@@ -1670,11 +1675,6 @@ blocks:
         Jääskeläinen
         s.
         k.
-    - text: |
-        Tapio Juhani
-        Jokinen
-        s.20.04.1975
-        k.
   - layer: 8
     label: 8. sukupolvi, Maija-Liisa Jokisen lapset
     links: [55]