Check and update thirdparty .ABOUT files for correctness, including in the CI

[pombredanne]

See aboutcode-org/license-expression#25 and aboutcode-org/license-expression#26 for an example of what's at stake and the CI integtraion

[pombredanne]

All the ABOUT files in thirdparties/ are correct
The ones in src and tests need some love. And AboutCode toolkit check needs to be added to the test suite

[pombredanne]

This is merged and completed