[jacob-williamson]

Fixes #164
Auxiliary scans can now themselves have required auxiliary scans. This allows us to ensure auxiliary scans are ran in the order air -> empty capillary -> standard sample, and also keep the timing benefits of combining auxiliary scans where possible. This is also true in tiled - each auxiliary scan will have links to its own auxiliary scans.

However, it makes things more complicated when looking for a suitable scan in tiled, because a standard sample scan in tiled is only suitable if the empty capillary scan that ran before it is also suitable to the experiment at hand. For this reason, we add the tiled scans own auxiliary scans to the requires field when reconstructing the tiled auxiliary object, which allows the .is_suitable method to verify all the requirements match.

There's quite a lot of recursion here but I can't think of a way to simplify things

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.68%. Comparing base (65a337d) to head (325762e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   98.67%   98.68%           
=======================================
  Files          23       23           
  Lines        1286     1289    +3     
=======================================
+ Hits         1269     1272    +3     
  Misses         17       17           

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[jacob-williamson]

We only really need to have a requirement of standard_sample now, as the others are nested inside it. Should we do that? Similarly StandardSample only needs to depend on empty_capillary. The advantage of having all of them is that tiled links will be added.

[DominicOram]

This is getting really quite complicated now. Can we have some proper docs on how we're doing auxillary collections in general? I think then it will be easier for me to review