[cleanup crusade] cleanup licenses

[paulfantom]

Add info about SPDX usage to LICENSE file in accordance to SPDX guidelines: https://spdx.org/sites/cpstandard/files/pages/files/using_spdx_license_list_short_identifiers.pdf

And remove license templates as they are also listed in https://spdx.org/licenses/

DO NOT MERGE yet.

[paulfantom]

Also fix Copyright year in REDISTRIBUTED.md per FSF guidelines: http://www.gnu.org/licenses/gpl-howto.html

[paulfantom]

Ready to merge

[ktsaou]

hm... are you sure we should not host the licenses? I thought we were supposed to provide these files in the packages we distribute.

[paulfantom]

I was talking with Trevor King from SPDX org about it and there is no benefit of having those. It is more important to have "Copyright" line in particular files than those templates, identifier + info about what identifier means is enough.

Also with this we don't have to remember about including new license template when we are adding some new file.

Fun fact, I haven't found any file licensed with WTFPL, but we are still shipping this license template.

[ktsaou]

ok, let's wait for @Ferroin to review this.
He worked on making github understand our license (have this GPL-3.0 logo at the top of the repo home page), so let's give him a chance to review this.

[ktsaou]

@Ferroin I also added you as a collaborator. Strange... I didn't have done this all this time...

[Ferroin]

I see no issues with it. Github's license detection should still recognize the project as GPL-3.0, as the text is about 97% the same as the GPL v3 based on the algorithm they use and most of the issue was the fact that they saw multiple things they thought were license files in the repository root.

[ktsaou]

so, merge?

[Ferroin]

Yep, LGTM.

[ktsaou]

merged!
Thank you @paulfantom !