IO to manage input files

[fedebenelli]

Right now we only work with Fortran/Python scripts as "input" files. Some kind of IO either by using a standard or a custom parser for Input/Output files would be a nice addition if we plan on deliverying a small executable at some point.

For now the alternatives I have in mind are

• namelist: Easy to read/write , also there are python libraries that generate and read this kind of files
• lua: It is relatively easy to embed lua in Fortran, so maybe using lua scripts as input files would be a nice addition. Since the input file will be programmable and the interpreter/parser can be embeded into the executable.

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.30%. Comparing base (904405a) to head (15980a3).
⚠️ Report is 912 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/io/namelist.f90	89.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #100      +/-   ##
==========================================
- Coverage   93.41%   93.30%   -0.11%     
==========================================
  Files          57       59       +2     
  Lines        2686     2735      +49     
  Branches      194      193       -1     
==========================================
+ Hits         2509     2552      +43     
- Misses        127      132       +5     
- Partials       50       51       +1     

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