Make software compatible with Visibilities class

[paolomassa]

First version of the modifications needed to make the software compatible with the Visibilities class

[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (main@dcd2a3e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
xrayvision/mem.py	95.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #67   +/-   ##
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  Coverage        ?   89.43%           
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  Files           ?        7           
  Lines           ?      890           
  Branches        ?        0           
=======================================
  Hits            ?      796           
  Misses          ?       94           
  Partials        ?        0           

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[samaloney]

Thanks looks ok - do the demos make ok images? Also does this version work with the stixpy as in do the images look ok.

[samaloney]

The test fails are from the examples need to update the examples too and make sure the images also look the same before and after.

[samaloney]

Nice, thanks @paolomassa