[SQLObject] Change to Converters.py breaks selects

[Edmund L. <el...@in...>]

The changes to Converter.py to refactor it has broken operations on the 
results of select operations involving queries...

Example:

 >>> p = Person.select(Person.q.id == 1)
 >>> p
<SQLObject.SQLObject.SelectResults object at 0x816960c>
 >>> len(p)
Traceback (most recent call last):
   File "<stdin>", line 1, in ?
   File "SQLObject/SQLObject.py", line 1084, in __len__
     count = conn.countSelect(self)
   File "SQLObject/DBConnection.py", line 149, in countSelect
     q = "SELECT COUNT(*) FROM %s WHERE %s" % \
   File "SQLObject/DBConnection.py", line 175, in whereClauseForSelect
     q = str(select.clause)
   File "SQLObject/SQLBuilder.py", line 157, in __str__
     return self.sqlRepr()
   File "SQLObject/SQLBuilder.py", line 219, in sqlRepr
     return "(%s %s %s)" % (sqlRepr(self.expr1), self.op, 
sqlRepr(self.expr2))
   File "SQLObject/Converters.py", line 99, in sqlRepr
     raise ValueError, "Unknown SQL builtin type: %s for %s" % \
ValueError: Unknown SQL builtin type: <type 'instance'> for co_person.id