* Keep funds with receipt holder

* Counterpart is optional

* Use named reserves

* Tests

* Benchmarks

* Fixes

* Update frame/nis/src/lib.rs

Co-authored-by: Keith Yeung <[email protected]>

* Update frame/nis/src/lib.rs

Co-authored-by: Keith Yeung <[email protected]>

* Update frame/nis/src/lib.rs

* Update frame/nis/src/lib.rs

* Update frame/nis/src/tests.rs

* Update frame/nis/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* Update frame/nis/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* Update frame/nis/src/lib.rs

Co-authored-by: Oliver Tale-Yazdi <[email protected]>

* Update frame/nis/src/lib.rs

* Update frame/nis/src/lib.rs

* Update frame/nis/src/lib.rs

* Update frame/nis/src/lib.rs

* Formatting

Co-authored-by: Keith Yeung <[email protected]>
Co-authored-by: Oliver Tale-Yazdi <[email protected]>