some code files omit explicit copyright and licensing header

[jonassmedegaard]

The following files, arguably containing enough creative work to be copyright-protected, lack explicit copyright and licensing header within the files themselves:

benchmark/weigh-pandoc.hs
data/bash_completion.tpl
data/sample.lua
src/Text/Pandoc/CSS.hs
src/Text/Pandoc/Data.hs
src/Text/Pandoc/Lua/Filter.hs
src/Text/Pandoc/Readers/DocBook.hs
src/Text/Pandoc/Readers/Docx/Combine.hs
src/Text/Pandoc/Readers/Docx/StyleMap.hs
src/Text/Pandoc/Readers/Docx/Util.hs
src/Text/Pandoc/Readers/EPUB.hs
src/Text/Pandoc/Readers/JATS.hs
src/Text/Pandoc/Readers/OPML.hs
test/Tests/*
test/lua/test-pandoc-utils.lua
test/test-pandoc.hs
trypandoc/trypandoc.hs

While the file COPYRIGHT covers these files, that is less reliable than explicit statements in a comment at the top of each file, as is done in general.

Please consider adding copyright and licensing headers for above files.