Add lookahead to LWS import wallet spec

Author: vtnerd

api/lightwallet_rest.md

@@ -238,6 +238,7 @@ list of candidate spends is returned.
 | blockchain_height    | `uint64`                 | Current blockchain height |
 | spent_outputs        | array of `spend` objects | Possible spend info       |
 | rates *              | `rates`                  | Current exchange rates    |
+| lookahead_fail *     | bool                     | Import lookahead failed   |
 
 > `rates` is omitted if unavailable.
 
@@ -266,6 +267,7 @@ spends is returned.
 | start_height         | `uint64`                       | Start height of response  |
 | blockchain_height    | `uint64`                       | Current blockchain height |
 | transactions         | array of `transaction` objects | Possible spend info       |
+| lookahead_fail *     | bool                           | Import lookahead failed   |
 
 #### `get_random_outs`
 Selects random outputs to use in a ring signature of a new transaction. If the
@@ -313,6 +315,7 @@ was actually spent.
 | mixin            | `uint32`         | Minimum mixin for source output  |
 | use_dust         | `boolean`        | Return all available outputs     |
 | dust_threshold * | `uint64-string`  | Ignore outputs below this amount |
+| lookahead_fail * | bool             | Import lookahead failed          |
 
 > If the total received outputs for the address is less than `amount`, the
 > server shall return a HTTP 400 "Bad Request" error code.
@@ -326,15 +329,17 @@ was actually spent.
 | amount       | `uint64-string`           | The total value in outputs              |
 | outputs      | array of `output` objects | Outputs possibly available for spending |
 
-#### `import_request`
+#### `import_wallet_request`
 Request an account scan from the genesis block.
 
 **Request** object
 
-|   Field  |       Type       |      Description        |
-|----------|------------------|-------------------------|
-| address  | `base58-address` | Address to create/probe |
-| view_key | `binary`         | View key bytes          |
+|     Field     |       Type       |       Description        |
+|---------------|------------------|--------------------------|
+| address       | `base58-address` | Address to create/probe  |
+| view_key      | `binary`         | View key bytes           |
+| from_height * | `uint64`         | import start height      |
+| lookahead *   | `address_meta`   | use subaddress lookahead |
 
 **Response** object