Example of using LAPACK in post_process

[sbryngelson]

This is an example of how one would use LAPACK in post_process. It isn't intended to be merged; it is just a static example of how to do this.

[codecov]

Codecov Report

❌ Patch coverage is 82.05128% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.79%. Comparing base (adcc0dd) to head (a1e9092).
⚠️ Report is 29 commits behind head on master.

Files with missing lines	Patch %	Lines
src/post_process/m_lapack_example.f90	81.08%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #939      +/-   ##
==========================================
+ Coverage   43.71%   43.79%   +0.08%     
==========================================
  Files          68       69       +1     
  Lines       18360    18399      +39     
  Branches     2292     2293       +1     
==========================================
+ Hits         8026     8058      +32     
- Misses       8945     8951       +6     
- Partials     1389     1390       +1     

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