Add uncertainties for main parameters.

[Sparks29032]

Closes #300

Need tests for warnings and each parameter separately (including baselineslope).

Need special handling for squeeze and func[x/y/xy] morph parameters.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.93%. Comparing base (fc45fa1) to head (5650feb).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #299   +/-   ##
=======================================
  Coverage   99.93%   99.93%           
=======================================
  Files          24       24           
  Lines        1480     1523   +43     
=======================================
+ Hits         1479     1522   +43     
  Misses          1        1           

Files with missing lines	Coverage Δ
tests/test_morphapp.py	100.00% <ø> (ø)
tests/test_morphio.py	100.00% <100.00%> (ø)
tests/test_morphpy.py	100.00% <ø> (ø)

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[Sparks29032]

Case where all parameters have uncertainties:

Case where certain parameters cause the Hessian to turn singular:

Tests and documentation updated. Ready to merge after review.

[Sparks29032]

Oops, previous one I ran only one of the tests I thought would be affected... fixed now.

[Sparks29032]

Loosened tolerance for checking numerics match. New algorithms and updates to old ones can cause some deviation (e.g. works on one of our tests on PR workflows but not others).