[Tests & Fix][#117] Adding UnitTests to the function dyslexia & HELP was 1d1e1l1p instead of 1e1h1l1p ;)

Adding some unit tests to the function guess_dyslexia.
By the way, the code is 'covered', and the option has been set inside the tests.
Theses UnitTests have permit to detect an anomaly in the source code solved in
this same commit