FCI + Fix to DirectRHF

[gustavojra]

• Fixing recent issues with DirectRHF
• Included new ConfigurationInteraction module with a FCI code.
• Add tests for fci
• New notebook example used @ juliacon.

[codecov[bot]]

Codecov Report

Merging #131 (b557df4) into master (ec463ef) will increase coverage by 1.73%. The diff coverage is 93.20%.

@@            Coverage Diff             @@
##           master     #131      +/-   ##
==========================================
+ Coverage   70.68%   72.42%   +1.73%     
==========================================
  Files          41       44       +3     
  Lines        2947     3198     +251     
==========================================
+ Hits         2083     2316     +233     
- Misses        864      882      +18     

Impacted Files	Coverage Δ
src/Core/Options.jl	100.00% <ø> (ø)
src/Tools/SinglePointEnergy.jl	89.47% <ø> (ø)
src/Methods/ConfigurationInteraction/FCI/FCI.jl	39.13% <39.13%> (ø)
src/Methods/ConfigurationInteraction/FCI/RFCI.jl	98.19% <98.19%> (ø)
src/Core/Integrals/AtomicIntegrals.jl	100.00% <100.00%> (ø)
...nfigurationInteraction/ConfigurationInteraction.jl	100.00% <100.00%> (ø)
src/Methods/HartreeFock/RHF/DirectHelper.jl	100.00% <100.00%> (ø)

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