Fix potentially misleading test failures
This is in response to https://github.com/zcash/zcash/pull/3590#discussion_r224677644
Currently statements such as:
```assert_equal("Embarassment", "Embarrassment", "Misspelling detected")```
Will produce essentially the following error:
```
Assertion failed: Misspelling detected; expected: <Embarassment> but was: <Embarrassment>
File "/home/eirik/Development/zcash/qa/rpc-tests/test_framework/test_framework.py", line 121, in main
self.run_test()
File "/home/eirik/Development/zcash/qa/rpc-tests/test_spelling.py", line 13, in run_test
```
Which is misleading because the item on the left is not what is actually expected.
This PR changes the assertion failure to be displayed as:
```
Assertion failed: (left == right); Misspelling detected
left: <Embarassment>
right: <Embarrassment>
File "/home/eirik/Development/zcash/qa/rpc-tests/test_framework/test_framework.py", line 121, in main
self.run_test()
File "/home/eirik/Development/zcash/qa/rpc-tests/test_spelling.py", line 13, in run_test
```
Closes#3467. Add benchmarks for Sapling spends and outputs.
Four new benchmarks are added to RPC zcbenchmark:
- createsaplingspend
- createsaplingoutput
- verifysaplingspend
- verifysaplingoutput
Remove GetUnspentFilteredNotes
Closes#3580
This PR generalized `GetFilteredNotes`, expanding its functionality to also do what we do in `GetUnspentFilteredNotes`. This enables us to remove the latter.
Make it clear that CWallet::GenerateNewZKey is Sprout specific
Closes https://github.com/zcash/zcash/issues/3577
When adding sapling support we had considered making the method `GenerateNewZKey` generic, but it ended up making more sense to add a second method `GenerateNewSaplingZKey` for sapling support.
This PR changes the name of `GenerateNewZKey` to `GenerateNewSproutZKey` and changes the return type from `libzcash::PaymentAddress` to `libzcash::SproutPaymentAddress` to make it more clear that this is what the method does.
