Use script matching rather than destination matching for watch-only.

This changes the keystore data format, wallet format and IsMine logic
to detect watch-only outputs based on direct script matching rather
than first trying to convert outputs to destinations (addresses).

The reason is that we don't know how the software that has the spending
keys works. It may support the same types of scripts as us, but that is
not guaranteed. Furthermore, it removes the ambiguity between addresses
used as identifiers for output scripts or identifiers for public keys.

One practical implication is that adding a normal pay-to-pubkey-hash
address via importaddress will not cause payments to the corresponding
full public key to be detected as IsMine. If that is wanted, add those
scripts directly (importaddress now also accepts any hex-encoded script).

Conflicts:
	src/wallet.cpp

src/walletdb.cpp

@@ -112,10 +112,10 @@ bool CWalletDB::WriteCScript(const uint160& hash, const CScript& redeemScript)
     return Write(std::make_pair(std::string("cscript"), hash), redeemScript, false);
 }
 
-bool CWalletDB::WriteWatchOnly(const CTxDestination &dest)
+bool CWalletDB::WriteWatchOnly(const CScript &dest)
 {
     nWalletDBUpdated++;
-    return Write(std::make_pair(std::string("watch"), CBitcoinAddress(dest).ToString()), '1');
+    return Write(std::make_pair(std::string("watchs"), dest), '1');
 }
 
 bool CWalletDB::WriteBestBlock(const CBlockLocator& locator)
@@ -410,14 +410,14 @@ ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue,
                     wss.fAnyUnordered = true;
             }
         }
-        else if (strType == "watch")
+        else if (strType == "watchs")
         {
-            std::string strAddress;
-            ssKey >> strAddress;
+            CScript script;
+            ssKey >> script;
             char fYes;
             ssValue >> fYes;
             if (fYes == '1')
-                pwallet->LoadWatchOnly(CBitcoinAddress(strAddress).Get());
+                pwallet->LoadWatchOnly(script);
 
             // Watch-only addresses have no birthday information for now,
             // so set the wallet birthday to the beginning of time.