Output netCDFs

[N1ckP3rsl3y]

• Instead of writing out values to *.csv files, create and write to output netCDF files
• Allow individual variable-precision in output, i.e., allow the user to choose which variables to write out
• Allow the user to specify how many years will be written into one file (e.g., 1980-1984, 1985-1989, ...)
• See #363 for more information

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 66.66667% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 72.74%. Comparing base (978146d) to head (422a96b).

Files	Patch %	Lines
src/SW_Flow_lib.c	44.44%	5 Missing :warning:
src/SW_Files.c	73.33%	4 Missing :warning:
src/SW_Control.c	57.14%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/devel_v8.0.0 #390 +/- ## ======================================================== - Coverage 72.80% 72.74% -0.06% ======================================================== Files 20 20 Lines 5640 5646 +6 ======================================================== + Hits 4106 4107 +1 - Misses 1534 1539 +5 ```

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