better symlink support for option.dict()

tests/dict/data/unicode2_symlink.dict

@@ -0,0 +1,4 @@
+{
+  "options.unicode1": "test",
+  "options.unicode2": "test"
+}

tests/dict/data/unicode2_symlink.dict1

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+{
+  "options.unicode1": "val",
+  "options.unicode2": "val"
+}

tests/dict/data/unicode2_symlink.json

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+{
+  "schema": {
+    "options": {
+      "name": "options",
+      "properties": {
+        "options.unicode1": {
+          "name": "options.unicode1",
+          "type": "string",
+          "value": "test",
+          "title": "Unicode 1"
+        },
+        "options.unicode2": {
+          "name": "options.unicode2",
+          "type": "symlink",
+          "opt_path": "options.unicode1",
+          "title": "Unicode 1"
+        }
+      },
+      "type": "object",
+      "title": "Common configuration"
+    }
+  },
+  "model": {
+    "options.unicode1": {
+      "value": "test",
+      "owner": "default"
+    }
+  },
+  "form": {
+    "options.unicode1": {
+      "clearable": true,
+      "type": "input"
+    },
+    "null": [
+      {
+        "title": "Configurer",
+        "type": "submit"
+      }
+    ]
+  },
+  "version": "1.0"
+}

tests/dict/data/unicode2_symlink.mod1

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+{"cmd": "config.option('options.unicode1').value.set('val')",
+ "body": {"updates": [{"action": "modify",
+                       "name": "options.unicode1",
+                       "value": "val"}]}}

tests/dict/data/unicode2_symlink.py

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+"""two unicode options
+"""
+from tiramisu.option import StrOption, OptionDescription, SymLinkOption
+
+def get_description():
+    """generate description for this test
+    """
+    option1 = StrOption('unicode1', "Unicode 1", 'test')
+    option2 = SymLinkOption('unicode2', option1)
+    descr1 = OptionDescription("options", "Common configuration", [option1, option2])
+    descr = OptionDescription("unicode2_symlink", "One unicode, one symlink", [descr1])
+    return descr

tests/dict/data/unicode2_symlink.updates1

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+{
+  "updates": [
+    "options.unicode1"
+  ],
+  "model": {
+    "options.unicode1": {
+      "value": "val",
+      "owner": "user"
+    }
+  }
+}