Add regressions test

Addition of regression test in the code

TODO list

• Add a test subcommand and add it to the Makefile
• Add the proper implementation of execute_all_tests
• Add implementation of tests
  • Compile the test
  • Execute the test
  • Compare values to known files (.result) if file does not exists creates it with the test
  • Compare observations
  • Catch errors to mark the test as invalid