Added eigenvalues output at DM construction

[cnegre]

This change is 

[codecov]

Codecov Report

Merging #119 into master will increase coverage by <.01%.
The diff coverage is 20%.

@@            Coverage Diff            @@
##           master    #119      +/-   ##
=========================================
+ Coverage   40.89%   40.9%   +<.01%     
=========================================
  Files          62      62              
  Lines       11697   11705       +8     
  Branches     1288    1292       +4     
=========================================
+ Hits         4784    4788       +4     
- Misses       6390    6396       +6     
+ Partials      523     521       -2

Impacted Files	Coverage Δ
src/prg_densitymatrix_mod.F90	64.42% <20%> (-2.58%)	⬇️
src/prg_system_mod.F90	42.08% <0%> (+0.17%)	⬆️
src/latte_mods/coulomb_latte_mod.F90	67.39% <0%> (+0.27%)	⬆️
src/latte_mods/ppot_latte_mod.F90	100% <0%> (+0.92%)	⬆️

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