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Drop fare-matcher dependency
It was used in arithmetic/expression test to generate more readable expression tree, but that
matters only when inspecting the parse tree for errors, not for the test themselves.
Switch test dependency from BPM to FARE-MATCHER
Now all dependencies are in quicklisp.
Commit update of test suite from `stefil` to `hu.dwim.stefil`
Add more tests.
Move BPM dependency to test suite.
Start adding tests for expression parser.
Change system definition file name to match system name.