[Rafael-SOWNet]

Found while working on #2335. No issue was filed.

An equation in a radical is raised to a power, which adds roots. Each root is then put back into the equation and dropped where it fails. With another name in the equation that can't be decided, so every root of the raised equation was answered:

sqrt(x + 1) + a + x = 0, then a given	2.6.0 and master	this PR
a = -5	{ 3, 8 }, and 8 is not a root	{ 3 }
a = 0	two roots, one of them not a root	{ (1 - sqrt(5)) / 2 }
a = 2	two roots, neither a root	{ }

Each root is now provided it is one, with the equation at that root as its condition, so giving the name a value keeps the roots and drops the rest. An equation in x alone is unchanged, since there the roots are decided when they're put back.

This touches the same place in FractionedPolynoms as #2335, so whichever merges second gets a conflict round.

Tests: the four cases in ARaisedRootWithAParameterTest fail on master. The 1,611 solve tests pass. There is a BREAKING entry, A root of a raised radical equation with a parameter is provided it is one.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.76%. Comparing base (0a58c74) to head (f78e54d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2337      +/-   ##
==========================================
- Coverage   86.77%   86.76%   -0.01%     
==========================================
  Files         312      312              
  Lines       68540    68542       +2     
  Branches    19938    19939       +1     
==========================================
- Hits        59474    59473       -1     
- Misses       4906     4908       +2     
- Partials     4160     4161       +1     

Flag	Coverage Δ
cpp	37.77% <ø> (ø)
csharp	87.31% <100.00%> (-0.01%)	⬇️
fsharp	32.97% <ø> (ø)
interactive	40.72% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...nuous/Solvers/EquationSolver/FractionedPolynoms.cs	85.91% <100.00%> (+0.40%)	⬆️

... and 5 files with indirect coverage changes

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