Close NestOR rmf file

[shreyas-arvindekar]

Using pmi.output to write and close NestOR rmf files

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 58.16%. Comparing base (a3f39aa) to head (4c4ea80).

Files	Patch %	Lines
pyext/src/macros.py	14.28%	5 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #264 +/- ## ======================================== Coverage 58.15% 58.16% ======================================== Files 31 31 Lines 13187 13184 -3 Branches 2469 2470 +1 ======================================== - Hits 7669 7668 -1 + Misses 5059 5056 -3 - Partials 459 460 +1 ```

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