Please review licensecheck

[Dominique Dumont]

Hello

I've modified licensecheck to fix some bugs [1]. I've added some non-
regression tests. All tests are running fine.

Even though, I'd like people who know better the history of licensecheck to 
review the changes I've made to make sur that I did not make mistakes.

All the best


[1] https://bugs.debian.org/cgi-bin/pkgreport.cgi?pkg=devscripts#_2_42_4
[2] https://anonscm.debian.org/cgit/collab-maint/devscripts.git

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