licensecheck: fixes and improvements

[Dmitry Smirnov]

Dear team,

Please find attached patches for licensecheck ('jessie' branch).
I expect them to be self-explanatory but if any doubts I'll be happy to answer 
your questions.

More changes to come.

Shall we change license names for compliance with 
copyright-format-1.0: 

	"BSD (3 clause)"    --> "BSD-3-clause"
	"GPL (v2 or later)" --> "GPL-2+"
etc.?
I hope everybody would agree with that.

-- 
Regards,
Dmitry.
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