dot notation for keys

[JohnAD]

Add a 'dot notation' flag to the init procedure. If set to True, then an attempt will be made on 'key' parameters in any method to parse a string to a key list if a '.' is found. So, "Address.PostalCode" becomes ["Address", "PostalCode"] automatically.

[JohnAD]

example:

new_list = PLOD(old_list, dot=True).eq("Address.State", "MO").sort("Address.PostalCode").returnList()