Use secure URL for link to GNU licenses

LICENSE.md

macros/make_report_irfs.m

src/@page/addData.m

src/@page/addGraph.m

src/@page/addParagraph.m

src/@page/addSection.m

src/@page/addSeries.m

src/@page/addTable.m

src/@page/addVspace.m

src/@page/end.m

src/@page/numSections.m

src/@page/page.m

src/@page/write.m

src/@paragraph/paragraph.m

src/@paragraph/write.m

src/@report/addData.m

src/@report/addGraph.m

src/@report/addPage.m

src/@report/addParagraph.m

src/@report/addSection.m