…, and s/ZC/ZEC/

Release v2.0.1

Clarify in sendmany/z_sendmany rpc docs that amounts are not FP

Fixes zcash#3539

I clarified in the docs that only 8 digits of precision are allowed. For example, if you try 9 digits you will get:
```
zcash-cli z_sendmany $TADDR  "[{\"address\":\"$ZADDR\",\"amount\":0.123456789}]"
error code: -3
error message:
Invalid amount
```

…tion, r=bitcartel

Add test to verify final sapling root in block header is updated.

Four new benchmarks are added to RPC zcbenchmark:
- createsaplingspend
- createsaplingoutput
- verifysaplingspend
- verifysaplingoutput

Make it clear that CWallet::GenerateNewZKey is Sprout specific

Closes zcash#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.

Remove GetUnspentFilteredNotes

Closes zcash#3580

This PR generalized `GetFilteredNotes`, expanding its functionality to also do what we do in `GetUnspentFilteredNotes`. This enables us to remove the latter.

…itcartel

Closes zcash#3467. Add benchmarks for Sapling spends and outputs.

Four new benchmarks are added to RPC zcbenchmark:
- createsaplingspend
- createsaplingoutput
- verifysaplingspend
- verifysaplingoutput

Fix error message

This error should never happen, but it may as well reference the method it is thrown from.

Fix potentially misleading test failures

This is in response to zcash#3590 (comment)

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
```

The only upstream change relative to the previous commit is that the
various Zcash-specific dependencies have been pulled into a cargo
workspace. The dependecies in the workspace use the same commits as the
crates we had previously vendored.

The patches are necessary to handle the fact that cargo requires that
dev dependencies are available even if not used, and we would otherwise
need to vendor all the underlying crates.

This ensures that the depends system's custom PATH is applied correctly,
and the pre-build Rust binaries are accessible.

Pass parameter paths as native strings to librustzcash

Fixes a user-reported crash when starting on Windows with a Cyrillic non-UTF-8 locale.

CI update

Updating package configuration from zcash

…me locked coinbases. Cheat catcher