Merge pull request #455 from Binnette/patch-2

Set common tags for trees

data/fields/diameter_crown.json

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+{
+    "key": "diameter_crown",
+    "type": "combo",
+    "label": "Crown diameter",
+    "snake_case": false,
+    "placeholder": "4 m, 9 ft, …"
+}

data/fields/genus.json

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+{
+    "key": "genus",
+    "type": "combo",
+    "label": "Genus",
+    "snake_case": false,
+    "placeholder": "Acer, Platanus, Quercus …"
+}

data/fields/species.json

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+{
+    "key": "species",
+    "type": "combo",
+    "label": "Species",
+    "snake_case": false,
+    "placeholder": "Acer platanoides, Quercus robur, …"
+}

data/fields/taxon.json

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+{
+    "key": "taxon",
+    "type": "combo",
+    "label": "Taxon",
+    "snake_case": false,
+    "placeholder": "Acer platanoides Columnare, Pyrus calleryana Chanticleer …"
+}