Optional mumps support

[fverdugo]

No description provided.

[codecov-commenter]

Codecov Report

Merging #68 (26fd2f8) into adding_mumps_petsc_functions (98cd668) will increase coverage by 86.60%.
The diff coverage is 100.00%.

@@                        Coverage Diff                        @@
##           adding_mumps_petsc_functions      #68       +/-   ##
=================================================================
+ Coverage                          0.00%   86.60%   +86.60%     
=================================================================
  Files                                 9        9               
  Lines                               790      806       +16     
=================================================================
+ Hits                                  0      698      +698     
+ Misses                              790      108      -682     

Impacted Files	Coverage Δ
src/Environment.jl	96.66% <100.00%> (+96.66%)	⬆️
src/GridapPETSc.jl	77.77% <100.00%> (+77.77%)	⬆️
src/PETSC.jl	56.00% <100.00%> (+56.00%)	⬆️
src/PETScArrays.jl	92.16% <100.00%> (+92.16%)	⬆️
src/Config.jl	36.36% <0.00%> (+36.36%)	⬆️
src/PETScAssembly.jl	77.30% <0.00%> (+77.30%)	⬆️
src/PETScNonlinearSolvers.jl	86.30% <0.00%> (+86.30%)	⬆️
... and 3 more

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