Interpolating if one or more of the dimensions has length 1.

[Qfl3x]

304

Still has a warning assertion in case all ivs have length 1. Otherwise it will build an interpolation object for the non-"singleton" ivs.

If the model is prompted to give the solution using the interpolator, it will silently ignore the missing ivs and only consider the ivs for which length is > 1.

Performance shouldn't be too big of an issue, though it would've been better to only do the singleton ivs lookup once.

It's all silent, so feel free to add warnings or let me know if you want warnings.

[codecov[bot]]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (6c8b78d) 69.95% compared to head (9af715e) 85.81%. Report is 13 commits behind head on master.

Files	Patch %	Lines
src/interface/solution/common.jl	20.00%	8 Missing :warning:
src/interface/solution/solution_utils.jl	80.00%	1 Missing :warning:
src/system_parsing/pde_system_transformation.jl	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #330 +/- ## =========================================== + Coverage 69.95% 85.81% +15.85% =========================================== Files 38 40 +2 Lines 1741 1769 +28 =========================================== + Hits 1218 1518 +300 + Misses 523 251 -272 ```

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[xtalax]

Hey, rebase and this should pass - thanks!