Verbose showerror for SingularException

[jishnub]

Currently,

julia> A = diagm(0 => [1.0, 0.0])
2×2 Matrix{Float64}:
 1.0  0.0
 0.0  0.0

julia> inv(A)
ERROR: SingularException(2)
[...]

After this,

julia> inv(A)
ERROR: SingularException: matrix is singular; factorization failed. Zero eigenvalue found at index 2
[...]

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (2a1696a) to head (c550974).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1204   +/-   ##
=======================================
  Coverage   91.86%   91.86%           
=======================================
  Files          34       34           
  Lines       15365    15367    +2     
=======================================
+ Hits        14115    14117    +2     
  Misses       1250     1250           

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