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[bot]]

Codecov Report

Attention: 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).

Files	Patch %	Lines
src/io/namelist.f90	89.47%	4 Missing :warning:

Additional details and impacted files

```diff @@ 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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