Products.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. As suggested by \@vpelletier, this should be
accepted as all methods were restricted by default earlier.

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

[Vincent Pelletier]

I think the commit message makes a logical inversion in my stance: before @kazuhiko's work on security declaration, these methods were public. Then they became private, likely because there was no restricted caller.

Other than commit message, can be pushed to master without waiting for the merge request.