Add MRC file writing support

[Pradyumn-cloud]

Fix Issue - #108

Add MRC file writing support

• Implement MRC.write() method
• Add Grid.export() integration for MRC format
• Added Test
• Preserve header information and handle edge cases

[codecov]

Codecov Report

❌ Patch coverage is 93.44262% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.20%. Comparing base (394161b) to head (37d03c3).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
gridData/mrc.py	92.30%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   87.78%   88.20%   +0.42%     
==========================================
  Files           5        5              
  Lines         753      814      +61     
  Branches       99      107       +8     
==========================================
+ Hits          661      718      +57     
  Misses         56       56              
- Partials       36       40       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[orbeckst]

Looks good at first glance but I am not an MRC expert. I'll see if I can get someone else to also have a look.

In the meantime, please also

• update your branch with the latest changes on master (just did that)
• add yourself to AUTHORS
• add an entry to CHANGELOG
• check your coverage and add tests where necessary

[orbeckst]

@marinegor do you have some experience with MRC files and would you be able to have a very brief look at this PR?

[marinegor]

Hi, thanks for the PR!

I've added couple of comments regarding self.header vs self._mrc_header, and regarding using with open(...).

Also, perhaps it's a good idea to add a small test MRC (say, 4x4x4 with random numbers) file with/without a header that tests things? This way we can actually track regressions if something changes in mrcfile itself, while a roundtrip test won't check that.

[orbeckst]

Some minor fixes required and please address @marinegor 's comments. That should also help with test coverage.

[orbeckst]

Sorry it took me a while to get back to the PR. Thank you for addressing all remaining issues and improving the tests. This is good to go and I'll merge.

[orbeckst]

@marinegor could you please have a quick look and confirm that all your concerns have been addressed? Thanks!

[orbeckst]

@marinegor , to my reading, all your comments have been addressed. I'll wait until tomorrow if you have any comments or want to explicitly approve but I also understand that you're quite busy and might not have the time to come back, in which case I'll dismiss your review and merge.

Reviewer's comments have been addressed but reviewer has been to busy to re-review.

[orbeckst]

Thank you for your contribution @Pradyumn-cloud ! 🎉