ZINT_WARN_INVALID_OPTION instead of 0 on ignored option;
more barcode synonyms
manual: append man page zint.1.pmd instead of CLI help;
various tweaks and fiddlings;
rMQR add ISO 23941 (released the other day but haven't got yet)
man page: expand and tweak
doc/Makefile: add HTML demo
HANXIN/QRCODE: use Hanzi/Kanji modes when compatible ECIs given
manual: one true source now manual.pmd from which manual.txt is generated
CLI: man page moved from frontend/zint.1.gz to docs/zint.1.gz, now
generated from docs/zint.1.pmd
add README.linux to root dir