Misc. Improvements

[avik-pal]

Checklist

• Export wrappers over LineSearches (So that switching to LineSearch.jl becomes easier)
• Ambiguity fixed
• Polyalg in 23 test problems
• Special case for small problems starting with a different polyalg
• Incorrect Jacobian size for NLLS problems

[codecov]

Codecov Report

Attention: Patch coverage is 96.77419% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.92%. Comparing base (52b3832) to head (81edf48).

Files	Patch %	Lines
src/default.jl	94.11%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #390       +/-   ##
===========================================
+ Coverage   56.66%   86.92%   +30.25%     
===========================================
  Files          46       46               
  Lines        2739     2760       +21     
===========================================
+ Hits         1552     2399      +847     
+ Misses       1187      361      -826     

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