Adding new constructor

[AntoninKns]

Adding new constructor requiring only the name of the problem, the group is then found automatically.

[codecov[bot]]

Codecov Report

Merging #53 (119739e) into main (7de12f7) will increase coverage by 1.06%. The diff coverage is 93.33%.

@@            Coverage Diff             @@
##             main      #53      +/-   ##
==========================================
+ Coverage   90.38%   91.44%   +1.06%     
==========================================
  Files           5        5              
  Lines         312      339      +27     
==========================================
+ Hits          282      310      +28     
+ Misses         30       29       -1     

Impacted Files	Coverage Δ
src/BundleAdjustmentArtifactFunctions.jl	85.03% <93.10%> (+5.03%)	:arrow_up:
src/BundleAdjustmentNLSFunctions.jl	93.33% <100.00%> (ø)

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[AntoninKns]

Why not remove the old constructor? It doesn't have any advantage, does it?

I kept it only to avoid breaking other existing packages. That being said I think I'm the only one to use it yet so I can remove it.

[dpo]

you can deprecate it just to be careful: https://docs.julialang.org/en/v1/base/base/#Base.@deprecate

[AntoninKns]

As stated in pull request #57, constructors had flaws which created bugs, for example with @deprecate macro. Therefore I chose to change them and close this pull request.