Change iquery to qset and qget

[Jaymon]

Where qset is called for a setting query (insert, update) and qget is called for a read query (select).

I also think it would be better for these methods to take the QueryField instance instead of the Query instance.

These are the things that would need to be done:

• QueryField needs to know in what context is being used for, Query.set should make the query field call qset while all the other methods should call qget (eg, eq_* and select_*)
• Modify QueryField.iquery to call the appropriate method
• Change the query methods to accept the QueryField instance instead of Query, this shouldn't break anything since I don't think I've ever actually used the method for anything.