Enable specifying byte order in packed

[kmnhan]

Hi, thanks for continuing to maintain igor2.

For some .pxt files we work with, it seems like setting the initial byte order to '>' is required to load the file correctly. This PR adds an optional byteorder parameter to the packed function to allow specifying the byte order, although I am not sure whether this is the optimal solution.

I have also attached the file that refuses to load: test.pxt.zip

[paulmueller]

Hey, I think this is a good solution. I could merge it as is, but...

Could you please add a docstring for load that explains this new argument (and if you have the time 🙏 ideally also the other options which are currently undocumented)?

And, trying not to ask too much here, would it also be possible for you to write a test function for this argument (with the file you provided, optionally with a smaller file)?

Let me know what you think!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.42%. Comparing base (589bcb2) to head (025fb0f).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   70.11%   71.42%   +1.31%     
==========================================
  Files          16       16              
  Lines        1014     1015       +1     
==========================================
+ Hits          711      725      +14     
+ Misses        303      290      -13     

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[kmnhan]

I have written the docstring and a test!

[paulmueller]

Just made the 0.5.6 release, thank you! 🙏