TTL Implementation (#261)

* refactor address generation code into libwallet, bool to flag whether to include proof, add sender address in init_send_tx

* rustfmt

* require payment proof addr as part of init_tx

* rustfmt

* store payment proof on sender transaction side

* rustfmt

* change sig to ed25519 sig

* rustfmt

* add message creation and signature

* rustfmt

* add payment proof verification function

* rustfmt

* validate proof on sender side, store proof

* rustfmt

* fix json tests

* fixes and updates to tests

* added API functions for converting and retrieving proof addresses

* rustfmt

* add payment proof to init_send_tx example

* rustfmt

* incorrect comment

* add commands for requesting payment proofs

* rustfmt

* wire up payment proofs into command line

* rustfmt

* add address command

* rustfmt

* added tor sending from owner api

* rustfmt

* add TTL to slate, transaction log

* ttl cutoff tests

* add ttl check to recieve functions, add tests, modify doctests

* rustfmt

* fixes from upstream changes and test fixes

* rustfmt

* remove unnecessary block header version check

impls/src/test_framework/testclient.rs

@@ -225,14 +225,24 @@ where
 			let w = w_lock.lc_provider()?.wallet_inst()?;
 			let mask = wallet.2.clone();
 			// receive tx
-			foreign::receive_tx(
+			match foreign::receive_tx(
 				&mut **w,
 				(&mask).as_ref(),
 				&Slate::from(slate),
 				None,
 				None,
 				false,
-			)?
+			) {
+				Err(e) => {
+					return Ok(WalletProxyMessage {
+						sender_id: m.dest,
+						dest: m.sender_id,
+						method: m.method,
+						body: serde_json::to_string(&format!("Error: {}", e)).unwrap(),
+					})
+				}
+				Ok(s) => s,
+			}
 		};
 
 		Ok(WalletProxyMessage {