Add support for storage parameters in CREATE and ALTER TABLE.

 * pyrseas/dbobject/table.py (Table.to_map): Add options to attrlist.
   (Table.create): Process options.  (Table.diff_options): New method
   to compare options.  (Table.diff_map): Call new method if needed.
   (ClassDict.query): Fetch reloptions.  (ClassDict.to_map): Add
   options to list of allowed attributes.
 * tests/dbobject/test_table.py: Three new tests.