Resolve "RPA tools"

Closes #71 (closed)

This change adds a test to the tool definition files for rpa_mrpapp and rpa_plot_chirpa. The corresponding test inputs and expected outputs are in the test-data directory.

This line in particular takes the tool output's name and compares it with the expected output file:

<output name="output_data" file="expected_rpa_results.txt"/>