Adds 'The Bitcoin Core developers' copyright headers in 12 source files. <start_year>-<end_year> is as per the history obtained from 'git log'.
The users to have touched them in the past are listed below. This was last discussed in pull request #7300:
In that discussion I can see perma-ACKs from @MarcoFalke, @gavinandresen and @laanwj.
So that leaves ACKs needed from: @sipa @jgarzik @luke-jr @theuni @ChoHag @calebogden @mrbandrews @casey @mitchellcash @brandondahler Phillip Kaufmann
Broken down by file:
contrib/devtools/optimize-pngs.py (@MarcoFalke, @jonasschnelli, @laanwj) contrib/devtools/security-check.py (@ChoHag, @laanwj, @theuni, @calebogden) contrib/devtools/test-security-check.py (@ChoHag, @laanwj) contrib/qt_translations.py (@gavinandresen) contrib/seeds/makeseeds.py (@laanwj, @sipa, @gavinandresen) contrib/spendfrom/setup.py (@gavinandresen) contrib/spendfrom/spendfrom.py (@gavinandresen) contrib/testgen/base58.py (@laanwj) contrib/testgen/gen_base58_test_vectors.py (@laanwj) contrib/zmq/zmq_sub.py (@jonasschnelli, @jgarzik) qa/rpc-tests/test_framework/blockstore.py (@mrbandrews, @MarcoFalke, @casey, @jonasschnelli) share/qt/extract_strings_qt.py (@ChoHag, @mitchellcash, @laanwj, @luke-jr, @brandondahler, Phillip Kaufmann, @theuni)