Actually apply the GNU licenses

[LilithHafner]

The GNU licenses contain instructions for applying those licenses to works. They say that, ideally, folks should add a notice to each file. However, the template as was did not actually state that the works are licensed under the included license. This PR changes that by copying the recommended verbiage from each respective license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (564c452) 92.95% compared to head (86c360c) 92.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #447   +/-   ##
=======================================
  Coverage   92.95%   92.95%           
=======================================
  Files          24       24           
  Lines         738      738           
=======================================
  Hits          686      686           
  Misses         52       52           

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[gdalle]

LGTM thanks, could you just add a link to the PR conversation to show where you took the recommended verbiage from?

[LilithHafner]

For GPL-3.0+ I got the text from

PkgTemplates.jl/templates/licenses/GPL-3.0+

Lines 635 to 648 in 46997ed

	Copyright (C) <year> <name of author>
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.
	You should have received a copy of the GNU General Public License
	along with this program. If not, see <https://www.gnu.org/licenses/>.

For GPL-2.0+ I got the text from

PkgTemplates.jl/templates/licenses/GPL-2.0+

Lines 294 to 308 in 46997ed

	Copyright (C) <year> <name of author>
	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.
	You should have received a copy of the GNU General Public License along
	with this program; if not, write to the Free Software Foundation, Inc.,
	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

For LGPL-3.0+ I got the text from

PkgTemplates.jl/templates/licenses/GPL-3.0+

Lines 635 to 648 in 46997ed

	Copyright (C) <year> <name of author>
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.
	You should have received a copy of the GNU General Public License
	along with this program. If not, see <https://www.gnu.org/licenses/>.

with slight modification.

For LGPL-2.1+ I got the text from

PkgTemplates.jl/templates/licenses/LGPL-2.1+

Lines 474 to 489 in 46997ed

	Copyright (C) <year> <name of author>
	This library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 of the License, or (at your option) any later version.
	This library is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.
	You should have received a copy of the GNU Lesser General Public
	License along with this library; if not, write to the Free Software
	Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
	USA

For AGPL3.0+ I got the text from

PkgTemplates.jl/templates/licenses/AGPL-3.0+

Lines 633 to 646 in 46997ed

	Copyright (C) <year> <name of author>
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU Affero General Public License for more details.
	You should have received a copy of the GNU Affero General Public License
	along with this program. If not, see <https://www.gnu.org/licenses/>.

[gdalle]

Thanks!