extend tests for scanning and parsing definitions (tst/testParser.hs)
extend tests for scanning and parsing definitions (tst/testScanner.hs)
update 'evaluate' to handle definitions (bin/evaluate)
correct typo (bin/evaluate)
change problem to the one from the book (usr/solve-5.3.6.hs)
rename exercises with leading zero
rmoe (usr/solve-5.1.1.hs)
rmoe (usr/solve-5.1.2.hs)
rmoe (usr/solve-5.1.3.hs)
rmoe (usr/solve-5.1.5.hs)
rmoe (usr/solve-5.2.1.hs)
rmoe (usr/solve-5.2.2.hs)
rmoe (usr/solve-5.3.1.hs)
rmoe (usr/solve-5.3.2.hs)
rmoe (usr/solve-5.3.3.hs)
rmoe (usr/solve-5.3.4.hs)
rmoe (usr/solve-5.3.6.hs)