centralized tags import/export into tags.py. Also added slo2eng and back as per 1088

src/model/entry.py

@@ -1,6 +1,6 @@
 from model.sense import Sense
 from model.editable import Editable
-from model.tags import TAGS
+from model.tags import import_label_list
 
 class Entry(Editable):
     def __init__(self, entry_xml):
@@ -28,17 +28,7 @@ class Entry(Editable):
             self.measure["type"] = measure.getAttribute("type")
             self.measure["text"] = measure.textContent
 
-        self.labels = []
-        for tag_xml in entry_xml.querySelectorAll("head labelList label"):
-            t_type = tag_xml.getAttribute("type")
-            t_value = tag_xml.textContent
-            
-            if t_type not in TAGS:
-                # using some default
-                t_type = TAGS.keys()[0]
-                
-            self.labels.append((t_type, t_value))
-        
+        self.labels = import_label_list("head labelList label", entry_xml)
         self.senses = [Sense(sense_xml) for sense_xml in 
                        entry_xml.querySelectorAll("body senseList sense")]