ZSQLCatalog: Make several schema-related methods public.

These methods will be used in erp5 catalog view in restricted environment.
Loosen the security on methods which we will use in erp5 catalog view in
restricted environment.

product/ZSQLCatalog/SQLCatalog.py

@@ -1106,7 +1106,7 @@ class Catalog(Folder,
     """
     return self._getCatalogSchema()[table]
 
-  security.declarePrivate('getColumnIds')
+  security.declarePublic('getColumnIds')
   @transactional_cache_decorator('SQLCatalog.getColumnIds')
   def getColumnIds(self):
     """
@@ -1143,7 +1143,7 @@ class Catalog(Folder,
         result.setdefault('%s.%s' % (table, field), []).append(table) # Is this inconsistent ?
     return result
 
-  security.declarePrivate('getResultColumnIds')
+  security.declarePublic('getResultColumnIds')
   @transactional_cache_decorator('SQLCatalog.getResultColumnIds')
   def getResultColumnIds(self):
     """
@@ -1157,7 +1157,7 @@ class Catalog(Folder,
         keys.add('%s.%s' % (table, field))
     return sorted(keys)
 
-  security.declarePrivate('getSortColumnIds')
+  security.declarePublic('getSortColumnIds')
   @transactional_cache_decorator('SQLCatalog.getSortColumnIds')
   def getSortColumnIds(self):
     """
@@ -1171,7 +1171,7 @@ class Catalog(Folder,
         keys.add('%s.%s' % (table, field))
     return sorted(keys)
 
-  security.declarePrivate('getTableIds')
+  security.declarePublic('getTableIds')
   def getTableIds(self):
     """
     Calls the show table method and returns dictionnary of
@@ -1892,7 +1892,7 @@ class Catalog(Folder,
     ids.sort()
     return ids
 
-  security.declarePrivate('getPythonMethodIds')
+  security.declarePublic('getPythonMethodIds')
   def getPythonMethodIds(self):
     """
       Returns a list of all python scripts available in