Add Be and Mg species

[neil-glikin]

Changes: add src/species/be9.jl, add src/species/mg25.jl, modify src/species/_include_species.jl

[codecov[bot]]

Codecov Report

Merging #84 (14c3ccd) into master (05bac1d) will decrease coverage by 1.8%. The diff coverage is 33.3%.

@@           Coverage Diff            @@
##           master     #84     +/-   ##
========================================
- Coverage    85.1%   83.3%   -1.8%     
========================================
  Files          13      15      +2     
  Lines        1163    1199     +36     
========================================
+ Hits          990     999      +9     
- Misses        173     200     +27     

Impacted Files	Coverage Δ
src/species/be9.jl	33.3% <33.3%> (ø)
src/species/mg25.jl	33.3% <33.3%> (ø)
src/operators.jl	86.6% <0.0%> (-2.1%)	:arrow_down:

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[jbroz11]

The way the information described for different ion species is processed is common and should be handled the same, but we should add tests that iterate through available ion species and ensure there aren't basic syntax errors (which I imagine are easy to make). Maybe just checking that we can instantiate an ion of every species would be enough.

[neil-glikin]

The tests as of now do try to instantiate an ion of every species (though this is as far as they go).